For me, absolutely. If something appeals to me in concept and looks pretty decent throughout development, and unless it is completely horrible at the end of beta, I'll give it a try at least. If however by the end of the free month it has failed to impress I'll drop it without subscribing and probably not give it another chance.

Look at Age of Conan. Apparently now it's a pretty solid MMO, and there are people really enjoying it, but I hated the launch, hated that the publicity and hype at launch was mostly bullsh*t and dropped it. I'd never re-sub to it, I can't even bring myself to try the free week.

Childish? Maybe, but in my opinion beta is for solving bugs and completing the game, not the period immediately after launch when people are paying to play (that includes the "free" month that you pay for when you buy the game), Iv've also dropped Champions Online for the same reason, not enough content and a pain in the ass unstable release period. I'll probably never resub to that either.

But, saying all that, it's not just about stability/bugs/etc. It's about gameplay, fun and content, I can look past all the bugs if a game is just plain awesome, as the bugs in time will gradually be fixed. If the gameplay is nothing special and there isn't enough content, why bother waiting and putting up with bugs and stability issues in the vague hope that maybe one day they'll improve on the game itself?

MMO's, you have one month from launch, and you can only launch once, make it count for a change.