Even if they just updated the shoes, added a few shots animations, a few new legends and updated the rosters/statistics I would still by 2K13. I absolutely love the style of play, probably more than any other format of any game.
I will be getting Live as well; I generally support the majority of EA Sports titles and I did enjoy the previous incarnations. I am excited to see what they have done with the past two years.
I liked the 2K11 gameplay better than 2K12. It's hard to explain but 2K11's gameplay was much better than 2K12.
I'm hoping they add more classic teams from the 2000's. Like the real Kobe/Shaq Lakers, 08 Celtics, 05 Spurs, 04 Pistons, some of the good teams that didn't make it to the Finals like the 05 Suns, 00 Blazers, etc.
I heard there was a lot of shit mechanics in the 2k12 gameplay where they tried to fix some bad things about the 2k11 gameplay but completely failed.
There were a lot of glitches to exploit such as holding turbo from half court and driving the paint for a contact dunk 99% of the time, a few unstoppable alley oop plays, big men could literally walk into the paint and do a standing dunk and a few other things. They patched most of the obvious things, but there is always more.