For some reason I think it may be better to buy the game when it will be fully released - then I can be sure that there isn't any bug, but it's just my own opinion and after all i think 95% people would like to buy it.
Yeah, TM2 isn't a good game directly for Steam. Imo Nadeo should make something that is similar to Steam, but it will have their own games and here I'm talking about the TM series. For Nadeo it would be an excellent sollution to many selling problems with the beta. I think Nadeo should do this - may...