The issue I have with Messi these days, is that his dribbling hasn't really gotten better from maybe 08/09 or 09/10. Of course, he can't dribble as much as a few years ago, due to the number of matches and the toll that would take on him. Also, he has elevated other sides of his game greatly, thus reducing the focus he had on dribbling in the past. What this means though, is that, although we see more consistent, direct impact in terms of goals, assists, we rarely get to see those long runs where he dribbles several players. That was perhaps the most appealing part of his game, at least for me.
Another thing that is affected, is that when his dribbling is really needed, in big games, it isn't sharp enough, oftenly. Perhaps I lay too much importance on dribbling, but in tight games, I think it's really important. Last season till today, his dribbling has seemed a bit sloppy compared to previous seasons. He's still the best dribbler in the world, and his productivity (goals, assists) is aaamazing. I just wish we could see more of his best dribbling!