After the big mess at launch (no connection, web down), I tried a few hours later, and I have to admit that this build is working fine so far. I created two characters, playing the tutorial twice. I experienced very little rubberbanding and no bug at all. I realize that there are bugs somewhere, but overall the game state is quite acceptable so far.
Thanks and grats Cryptic.
PS : I'll still rant and whine in other threads, but when something is working fine, honesty dictates to say so.