Ireland haven't looked like losing a game after the 55 minute stage once this year, with only Australia and France looking like they could have beat them in the games they won last year, so not really. The only criticism I have of the team is they aren't as clinical as they should be, Ireland should have scores at least one more try yesterday but couldn't. It's the only area that I think would stop them from beating New Zealand where tries are definitely needed to win.
3 pretty comprehensive victories where the biggest leads have been 20, 12 and 16 points with the smallest winning margain being 7 doesn't sound as if they're letting teams back in to me. Considering the team aren't conceding tries I always feel when watching them that once they've got a lead of 8+ it's game over. I wouldn't be at all surprised to see Ireland not concede another try in the championship, which would certainly guarantee them the most impressive grand slam since '03. That must be their goal as well no matter what anyone in the camp says!
I personally find it more impressive to score more tries as opposed to just not conceding them. Wales 05, for example, was more impressive to me than 12.