All keepers are eccentric, you'd have to be to stand there and let guys run at you full bore and dive at their feet, we all know valdes is a very very good One-on-one keeper, just ask HENRY, Valdes saved our bacon in that final with some supreme saves.
Like i said before i think all this touch he gets, and involvement makes him very very confident, which is great, but sometimes he gets carried away - like when you go wandering with your keeper in FIFA or PES and the commentator says "This fella thinks he an outfield player" He does, and he isn't. He'll remember this for 9 months then build up enough courage to try again.....
His weakness is his composure, it's a hard gig being the barca keeper, you need to distribute short, none of this big punt stuff (he throws lots) none of this kick it to centre line from a goalkick - he mainly passes short. and if he hits long the ball usually comes back to him from the midfield or the defence to play around the other side, he ACTIVELY participates in movements.
Casillas doesn't pissfart around with the ball as much, but he has more action, more saves etc... He is a more traditional keeper. Would a traditional keeper work at Barca?
Valdes is ok, like i said its a tough gig, but he'splaying for Barca and there shouldn't be any excuse and the criticism is warranted, he'll do something good soon and then the "black power" fist pump he does to celebrate a good save or penalty save will be shown haha!