Apologies this may seem a bit of a rant but I just got typing, feel free to ignore!
I think the point about the injuries is a fair one. He was not helped by them. However, I would argue that injuries have actually forced him into better selections in the past. For example, I don't like to speak ill of anyone but I was thrilled from an England supporter's perspective in terms of how I want the team to play to see Barritt injured. His selection is entirely negative and backwards looking. Last season injuries at centre to his preferred partnership made him pick more exciting, attack-minded players and it was a great improvement.
The long and short of it for me is that England have won one 6N and no Grand Slams since 2003. If you'd told me that after the final of the WC that year I'd have thought you were trying to wind me up. I know there was a rash of retirements and coaching change, which explains a year or two of failing to compete. However, to have not grasped the nettle and taken the necessary steps since then is pathetic. The RFU is 99% to blame. I've been saying ever since the WC win that they have failed dismally to do what has to be done, which was to use the RFU's resources (easily the richest union in the world) to cherry-pick the best coaches in the world and get them to England. It was laudable for a while to try and continue with English coaches but it has failed and the results conclusively prove it. France also have the same policy with similar results. Wales and Ireland are willing to accept the need to pick from the whole pool and have achieved success.
For me Lancaster has to go. He has a number or flaws which overshadow his undoubted successes. First and key he has no idea what his best team is. He has had four years. He needed to identify and stick with his best players, even through dips in form. Throwing out the 9 every year and then bringing them back etc is just plain stupid. Pick the best and only change them when you have to (injury, unarguably better player, age). You won't see Gatland or JS constantly tinkering with their team. Ireland lost O'Gara and then turned to Sexton. You'll not see JS decide to change to Madigan for the WC then back to Sexton for the 6N and Madigan again in the Autumn Internationals. There are several scrum halves in Ireland but they have decided Murray is the man so he plays, and so on. Gatland has decided Mike Philips has had his day so he goes to sub and he won't get back into an extended run. I know Lancaster has a lot more players to pick from but all successful teams have a core selection that does not change every 5 minutes. There is little to choose between the various scrum halves so pick one and stick by them.
Also he has a bizarre and frankly nonsense policy of making substitutions at certain times of the match regardless of the state of the play. He will whip off the scrum half even if he is playing a blinder and break up the flow. Several times this has resulted in major shifts and even losses of games. He persists in selecting some players beyond all sense. Call me old-fashioned but a hooker who can't throw in is not worth selection. Tom Youngs is great around the park, dynamic and mobile but his line out is dross. I was screaming at him not to bring him on Saturday and he immediately lost his first two line outs both close to the French line. Likewise Mako Vunipola, a prop who can't scrummage. Again no matter what the impact he can have in the loose he's a complete liability at scrum time. Lancaster seems to prefer brawn over brain and defence over attack. His natural game seems to be to stymie the opposition and then play territory to grind out results. hence Farrell made sense as a 10 since his inability to do anything except kick to international standard was not a problem, he was there to turn territory into points. I don't think Farrell senior is much of a back's coach either. Rowntree has the forwards well-drilled, except Youngs's line out but the backs make so many errors and lack conviction and faith in themselves.
In short for me Lancaster is a decent, honest and likeable man but not a top quality international coach. Until the RFU decide to have a proper, rigorous selection with the aim of choosing the coach who has the best record with players such as those available to England then we will continue to fail (like Warrenball suits the Welsh players available). I won't hold my breath, 12 years on from the WC win and still no Grand Slam. The record shows Johnson as the best coach we've had since and that is nothing short of a joke!
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I agree we have not been the best team in those four years but certainly in 2013 the ***le was won, all that had to be done was to escape from Cardiff without a massive spanking. Failure to achieve that was a major flaw for me.
I feel England have a generation of players in the likes of Brown, Launchbury, Armitage, Lawes, Coles, etc, etc which are as good an assemblage of players as any other in the 6N and we are in danger of wasting that generation by poor coaching. I feel that the players available should have won a ***le in the last 4 years. Why they haven't is arguable. It might be bad luck but to be pipped two years in a row on points and then once by a crazily dire performance is unacceptable. Last year the French result was thrown into sharp relief when we won all the other games. That team was the best in the tournament but an inability to finish off a misfiring French team despite total domination of the game was unforgiveable. This year I'll happily accept Ireland were the best and last year they made themselves the best by bloody-mindedness and organisation when England threw it away right at the start. If we'd built on last year we would have won this year comfortably for me. The pieces are all there and properly used they would slot together into a winning team. Not a team that would sweep away all else, Ireland and Wales are too good, but one that would win one in four. Not much to ask for a union with so much money and resources.