Jace sucks at Sims 3 because he views it more as action figures or a movie he thinks he can direct. It's very easy to do those things in a Sim game but you have to actually maintain your sims, make sure their bars are full and their moodlets are good. He doesn't give a fuck and yanks them away from actions they NEED to do or finish (like making a grilled cheese sandwich). Another thing that is fucking Jace over is the Dexter mod. It allows you to kill people but it also gets you arrested if you're caught and people will generally not like you if they see you killing someone. Jace will kill anyone at the drop of a hat and then freak out, taking everything personal.
Jace actually started out his sim using cheats. He had a mansion, he admitted to using console commands to make other Sims like him. He went into a game, giving himself everything, but not know anything about the fucking game. I'm not sure but I believe someone has suggested that he also used a mod to give himself EVERY trait, both good and bad. This is how he got the unlucky trait and possibly a bunch of other bad ones. It doesn't help that he chooses rude/mean conversation choices just because he's frustrated in real life. You can't really bully your way to success very easily in Sims games. I haven't played Sims 3 on PC but reputation seems like a very big thing. If Jace was playing Sims 1 or 2 he probably wouldn't be getting as much shit for his Sim being a dick.
Also he needs to fucking buy and use a shower. Jesus christ.