I agree with you on the 3 game series. Even the worst team in the league might have a single ace starter to win 1 game and might be able to just grind out the other for a 2-0 or 2-1 win.
I might go a little deeper though and blame the "wild card" concept as a way to increase the duration of the season and the number of playoff games. Should teams that fall > 10 games behind the division leaders make the playoffs? Do we need 3 of them? Perhaps, of the 3 division winners the 2nd and 3rd seed have a 5 game for the right to play the 1 seed in a 7, then to the WS. At the worst I can see a single wild card team, this rewards the team that probably just had the #1 seed in their division.
All that being said, I feel the season is WAY too long. I'd be happier with half the games with the WS in August.