The one thing I can think of that I really didn't like of theirs is anything they did with Elton John. But that was after Freddie died, so it really doesn't count!
Seriously - I can't think of anything they did wrong in their career, they just did heaps of stuff that pissed people off, and those are the things I *really* like about Queen.
Playing Sun City? HELL YEAH, that was one heck of a good move. I love hearing uptight assholes going 'no they're supporting the evil regime...' blah blah blah. They had the right idea, trust me.
Dressing in drag for I Want to Break Free? So what if America didn't 'get it'? In my view it's another career high, it's just so damned funny.
Their 'royalty of rock' behaviour that so used to incense those assholes at NME in the 70's... again, I cannot fault them. You only live once, you might as well enjoy a bit of champaign during a show (I can't abide that "Is This Man a Prat" article. It's full of shit).
Everything about Queen from 1973-1995 kicks arse. Those losers who were into Punk in the late 70's used to shit on Queen, so what did they do? They did "Sheer Heart Attack", which was BETTER than the rest of that crap! Stick it!
If you want to waste time crapping on what someone did 'wrong', then yeah - you'll eventually come up with a nice big fat list, but that begs the question - why the heck bother?