I'm sure I'll get attacked for this but here is my perspective...
I watched a large amount of college basketball (it is the better version in my mind) and have been watching Smart since halfway through his freshman season. He has some amazing qualities most of them previously stated by others on this forum, but here is my attempt at a concise list
+ Size, Strength, Physical Tools
+ Determination, Will, Competitiveness
+ Defensive ability to lock down opponents
+ Ability to hit big shots, penetrate and get to the line
+ Great Rebounder
+ Natural Leader
- turn over prone
- poor shot selection
- flops (often unfortunately)
+/- Intensity (live by the sword die by the sword)
The player he most reminds me of in playing style is Lebron. I AM NOT SAYING HE IS GOING TO BE THE BEST PLAYER IN THE LEAGUE. He just plays in the same mold. Ball dominate at times, controlling the game with his physical tools, bullying his opponents with his strength, not a great shooter but hits big shots/timely shots. I've been trying to make a comparison for him since last years draft when I thought Orlando was going to take him with the third pick, but as I watched him this season the style of Lebron's game just screamed out to me. They're just the only two guards who I see use their gifts that way. (Of also lived in South Florida for the last decade and seen an unfortunate amount of Queens James). He'll be great with or with out Rondo as long as Rondo can deal with watching the ball move around to teammates, which is a worry I have about him anyway. My two cents.
another poster shared this
http://grantland.com/features/marcus-smart-returns-oklahoma-state/Read it. The things some of these kids overcome is nothing short of amazing.