Ireland were pretty good all round. Looked pretty fluent, moved the ball around well, looked like they knew what they were doing.
I might add, to be fair, that I am a rugby league fan first and foremost, but I do follow RU too. My take so far would be:
Ireland: Look pretty strong all round. Appear to have two good 9s. I'm less struck than many about the God-like genius of Sexton, but he did fine today. The new boy did himself no harm either.
Wales: What to say? They didn't do great with the set-pieces, so I'm sure that had a lot to do with it; I'd have to have it to people most expert than me to explain exactly what else wasn't right. They have the guy who is apparently the best strike weapon in the comp, but he spent his afternoon defending.
Scotland: They have some very skilful and creative players, who can always pull a try out of the bag, but I can't hep but feel that they need a slice of good fortune to go their way to prosper. They don't look like a side that can dominate a match.
England: I dunno. As I said upthread, I didn't watch this game as closely, but I don't think they looked too far off. I like Smith a lot (as any league fan would), and think he went pretty well. But pressure didn't turn into points. I like Simmonds a lot too, and he seemed to go pretty well, and Curry looked energetic. Again, I hope someone more expert than me can shed further light!