They've been ridiculous. Posted this on another forum lately but will copy it here because it's just, well, nuts:
Their record is even more crazy than I thought.
Between the beginning of season and December 1st, they went 7-12. It's poor but what you would expect from their current team. That would give them 30 wins over course of season.
Starting Monday 21th November they went on a 4-18 run until January 13th, this is plain tanking and completely awful. That's a 15-67 team here. Something happened in that Milwaukee game though, something inexplicable which turned the NBA around. Milwaukee have gone 2-11 (despite being in playoffs spot with 20-18 at the time) since then while Miami have gone 12-0, all the way for 82-0!
2K have introduced this "Start Today" mode in their game this year and around the beginning of year I thought I would start campaigns with Miami, Dallas and Philadelphia to try and pick them up from their dreadful records and maybe make playoffs with one of them. I'd never imagine doing as well as they have been recently even in a video game on a lowish difficulty level.