Everyone involved with the Super Mario Brothers movie should be hated for participating in that mess. Bad movies are bad movies and they both had a large part in it being that bad. This movie is a major stain on both actor's careers.
Same with Freddy Prinze Jr, except he doesn't have the track record of good movies that Hoskins and Leguizamo have to make up for the awful movie he starred in.
Now I might be wrong. However, Vega's seemingly puppy dog devotion to Shepard gave me the impression that he's going to be one dull character. And Freddy's track record of highly dull and wooden characters is also a pretty big sign from the universe that Vega either will be as hated as Kaidan or as forgotten as Jacob for his dullness by the end of ME3.
Well, he played a character in 24 that was more grown-up than everything else I'd seen him in. I wouldn't be surprised if that was one of the factors in him being cast in ME, in fact. From what little I've seen of Vega, he's pretty similar to Prinze's character in 24. Both dull, generic military types ...
I have to say, I think characters are ME's weakest point.