I have said this before and think it needs repeating: Marcus' biggest problem is he thinks he is a much better offensive player than he actually is. When Smart plays his game in his role, being THE best guard/wing defender in the game with solid playmaking ability and a slightly above average three point shooter, he is amazing.
When he forces himself to be more than that, his passes get too cute and become turnovers, his drives become desperate heaves hoping for a foul, he looks to shoot way too much, taking bad, early in the clock or way too far from the rim threes.
And sometimes these things lead to bad defensive lapses and/or technicals. Or even off court problems like going after refs or punching pictures.
That said, when the team is down 2-3 of it's top 4 players, Smart has to try to elevate his offensive game and I have no problem with the extra shooting. Smart took lots of shots against Utah, but most of those shots were the right shots to take.