To offer a neutral opinion on back rows...
Lydiate's a fine player, if a little raw, as is Warburton. Not a lot to choose between them and the Irish flankers. O'Brien's probably the best loose carrier out of those who will be on the pitch but Warburton's by far the best ball hog. If Ryan Jones has genuinely recaptured form there's not a lot in it at 8, but Heaslip gets through a lot of work compared to anyone. Hard to call an advantage. Ireland will look like dicks if they can't shunt Warburton off of the ball, but Wales are going to look like dicks when the counter-rucking starts and as per orders there's one guy trying to protect Philipps.
I also assume both teams will have tools on the bench in Powell and Leamy. I look forwards to that tooltastic showdown which should answer the question of "How best to give a penalty offence at a ruck when the other team have knocked it on and you're going to get it anyway".
In an ideal world, the best thing that could happen for this fixture is for both coaches to somehow get locked into the toilet so they can stop sucking the life out of their teams and let 30 very good rugby players actually get on with doing that.