The game lags for me but it's quite possible to play still. I had big problems with games like LaTale, there was no way I could do anything with the lag, the monsters would kill me before I could even hit back. With Wakfu though, you have some time to make your moves and you should be able to complete a fight just fine, but it takes patience. It's still only OB and there are a lot of things that need to be fixed, but I'm very optimistic about the final outcome.
Give it a shot. >:3