I've used supersim a lot in NCAA And Madden over the last 4 years, and the option has never been improved, or, if they have improved it they've just missed obvious things. I use it a lot because I suddenly find I dont have time to finish a game, or something.
The biggest annoyance is clock management and clock runoff. If you use super sim, a running play takes 4 seconds, a passing play takes 2 seconds, a long passing play takes 6 seconds. There is no runoff after plays and the AI does not manage the clock.
So, let's say you have a lead, it's under 1:30, and the opposing team has no time outs. So you figure, well let's just super sim this, the CPU AI should choose running plays or down the ball and end the game. Because there is no clock run off, your QB will kneel the ball (-2 yard rush), and it will take whatever the time it takes in game, and nothing else. So, your "drive" will be 3 -2 yard rushes that will burn ~10 seconds off the clock, and you'll be punting to your opponent with 1:20 left after going 3 and out. The whole mode is like this, but that's the most glaring example. It's frustrating to see 12 play scoring drives take ~0:45 and makes the mode almost useless. Other glitches? Super sim stops the clock. So if your super sim runs it, and then you come back out onto the field to run the next play, the clock is stopped.
I still use it though for when I have a large lead and I just want to quickly get through the game... although in most cases, I need to end up taking the ball back and running clock or else it won't burn enough time.