SFOG is by far the best worst combo in terms of looks great on paper but the clientele and disgusting operations just destroy any chance of enjoyment.
Kennywood is pretty bad too - I've never been anywhere where I felt uncomfortable because every single person looked identical. Same face structure, build and all wearing Steelers merchandise. Unlike Gavin, I felt like I would enjoy the park a whole lot more if it wasn't for the people, who were numerous, loud and weirdly awkward. Their no single rider policy on their wooden coasters meant our group of 3 had to take turns sitting next to one of those... People. You get stared at a lot there if you aren't a local. Stared at by mouth breathers.
And I agree with the PortAventura comments, though honestly, is that not just all Spanish parks? How a nation produces such over hyperactive teens who turn into adults who fall asleep at any given second is beyond me. You have to deal with people right up your arse the entire time in line, vandalism worse than a subway in a ghetto, queue jumping... And no one cares. No one. The staff move at a snails pace, and vanish for a siesta at any given moment.