Any of Birds championship teams would have been able to make short work of the 2011 Mavs or the 2012 Thunder. Could you honestly say the same about Lebron's Heat vs. 81 Rockets/Sixers, 84 Lakers, or 86 Rockets? Bird never had a finals performance as bad as Lebron in 2011 or 2007, yet Lebron has never had as good a finals performance as Bird has against much greater opponents.
Bird: 1984 Finals MVP: 27.4 ppg, 14 rpg, 3.6 apg, 2.1 spg against the Showtime Lakers.
Bird: 1986 Finals MVP: 24 ppg, 9.7 rpg, 9.5 apg (basically a tripple double) against a very solid Hakeem Olajuwon led Huston Rockets team that beat out the Showtime Lakers in the WCF.
Lebron 2012 Finals MVP: 28.6 ppg, 10.2 rpg, 7.4 apg, 1.6 spg against a very green OKC team with a top 5 and a top 15-20 player at his side.
Even when Bird lost in the finals twice to the Showtime Lakers, he never played as bad as Lebron did in the 2011 finals or the 2007 finals. Bird won his first title in his second year in the league against a great Moses Malone lead Rockets team, averaging 15 ppg, 15 rpg, 7 apg and 2.3 spg, so don't give me crap about how Lebron was young when he played in the 2007 finals.