They don't technically have more power, they just happen to play better than the other team they go up against. They never get homefield, that in itself should be a reasonable harm. Afterall, they could technically have the second best record in their League. Being a Wild Card in baseball doesn't mean they're bad, just not the best team overall.
I'll disagree with that, slightly, as I think I see what the other guys are asking about.
Basically, it's set up as a 2-2-1 format right now, and first to 3 wins, right? If the WC team wins one of the first two in the away park, they've then got 2 home games to try and wrap it up, which is a nice advantage. Win both away games, and it's really over. if it was 2-1-2, it would at least force the WC team to win it all on the road, really, or crush the other team. Even worse in the 7 game series, with the 2-3-2 format, as if you split the first two, the pressure is totally off.
They won't do that, as they want fans of both teams involved, but i can kinda see that.