You really don't see a difference between the 2012 Thunder and the 2014 Thunder? Just for starters, one of the two teams has a vastly-improved Kevin Durant who's going to be named MVP in a day or two. I'll leave it to you to figure out which one that is. 
But seriously, the 2014 Heat are worse than the Heat we saw in 2012; not even just off record alone, but from the actual contributions of the players. Also, again, the Clippers aren't a grind it out team; that's not really how they win games. They win by overwhelming you on the offensive end more often than not.
I am sorry, but this is absolutely ridiculous.
You must be the only person in the world who thinks OKC is better without James Harden, who was basically their only closer.
You are also probably the only person who doesn't think Miami is better now that they have actual help (Ray and Birdman, their first interior presence).
You've also got to take into consideration where LeBron is compared to 2 years ago. He has slowly gone from 50% on FGs to a Jordan-esque 56%. He also couldn't really shoot yet back in 2012, he was still a bull who you could make things harder on by keeping out of the paint. He shot 26% on 3s in those playoffs despite attempting 3.7 per game (whereas he's actually above average now).