Obviously speaking for myself here, but I did enjoy the Jordan challenge mode. I also very much enjoy NBA2k11/12's regular gameplay.
To me there aren't any glaring issues with gameplay that get magnified in 2k's My Player or Jordan challenge mode, which IMO is the case in RTG/Superstar.
I can't enjoy RTG/Superstar mode due to the often wonky gameplay of NCAA/Madden. Based on what (admittedly small bit) I saw in the webcast, Heisman Challenge looks just like RTG but with a cheesy bullet-time effect thrown on top, so I don't think I can enjoy this either.