Part of me would have liked to have seen Mace killed by Boba, but honestly, it probably would have been a bad idea ... if only because he would have been too young to justifiably have pulled it off. Then again, it would have been a great "vengeance" side-story.
But oh well.
pr1983: Part of it is just that I dislike jedi in general, I think (I'll be honest and candid: I have a serious problem with a philosophy that holds that, among other things, supressing your emotions is a key to enlightenment). Part of it is his costume was really cool -- come on; you know it was! 😉 And then of course there's the fact that characters who live in moral shades of grey appeal to me.
But okay. Seriously? The movie didn't show much of what Jango could do, other than he had a solid showing against Obi. And yeees, I know his objective was not to kill Jango, but I also don't recall a single moment when he COULD have killed Jango even if he'd been trying to. The fight with Mace, given the jetpack fiasco, was a non-fight. And I've said enough about that already.
But Jango's genuinely impressive feats are covered partly in Open Seasons (a graphic novel) and partly in ... well, frankly, in a game. Bounty Hunter. But whaddaya gonna do? 😉
Anyway, as I said before, he defeated Komari Vosa among other things -- here's a link to her bio since I keep tossing that name out:
http://www.starwars.com/databank/character/komarivosa/eu.html
No, it doesn't prove he could beat any jedi who ever lived ... not by a long shot. But it does at the very least prove that it was not entirely beyond him to defeat an experienced Force-user in a direct confrontation, and it sheds a little light on why he was chosen as the template for a clone army in the first place.