BCS never got it wrong--Nebraska vs Miami? USC vs OU? OU vs LSU- none of these games were ever competitive. BCS did get it right sometimes, but not always. Close wins, hum, we had a few a close win at Mizzou in order to win the Natty. Close wins teach teams and players how to win under pressure.
The 12 team playoff will be a good thing. The only negative that I can actually think of is injuries, team that are beat up after the regular season and lose because of attrition, not talent or scheme. This will be school like TCU, K-ST, Ohio ST and maybe Michigan. Georgia, BAma, and Clemson most seasons have more depth at key positions. Bama will benefit from a playoff with more teams. After watching yesterdays games, for sure they were one of the top 4 teams in the country at the end of the season. SEC dominance is real, and I don't see it leveling out anytime soon.