Shooting can be improved. Most guys think that they are all world and do not put in the time. Sometimes they practice but are only practicing their bad habits.
Agreed, that's why he needs a professional shooting coach.
Didn't Marcus change his shot last year? I assume it takes more than a season to change your mechanics. I think he'll improve but not to a spectacular amount. But still an improvement to average for Smart will be big.
By far his complete inability to drive: by defenders, into the lane, to the rim, to open things up.
Tony Allen is a good player and was very effective on a contending team in MEM. Unfortunately, we drafted Tony Allen type(better playmaking potential but no driving) with the 6th pick. He is a guy that could get better if he can drive the ball but he is a RFA next summer and may cost 14million. His stock is higher due to the playoffs and the Cavs series, maybe it would be good to trade him if there is a good chance he walks next year.