I would definitely agree with Dan that it is well worth visiting some of the other major European theme park resorts to get some balance. I know that there are alot of people who do just keep returning to PA and not giving any other resorts a chance which I think is a shame. PA was actually the first European theme park resort I visited back in 2005 and have since been to Europa, Efteling, Phantasialand, DLP, Gardaland, Parc Asterix and various other non-resort theme parks on the continent.
Operations wise PA is one of the worst sadly (although not as bad as Parque de Atracciones Madrid which is the worst I've seen anywhere). PA are certainly the worst for staggerred openings which I know annoys alot of people but has never really been a big issue for me as I tend to just get to the park for about 11:45 each morning, which I don't mind doing since most of the rides open late and the breakfasts at the hotels are top notch, plus it's in the Spanish culture to get up later so I like to be a local
In terms of ride hardware, I disagree about the coasters, although all opinions on coasters is entirely subjective so I appreciate others thinking differently. I really wnjoy Baco, Stampida and Shambhala and find Dragon Khan to be the weakest coaster (although still enjoyable). I would actually say in terms of thrill rides PA has the best collection of any park in Europe, Hurakan Condor is awesome too. But again this is down to personal opinion.
I do object to the way templo del fuego only opens at peak times and would say that this is wholly unnecessary, especially during the Christmas holiday period when the park definitely had enough people to justify opening it.
Despite what I see as the quite minor flaws of PA, I still keep returning there and favouring it over the other resorts I have visited in Europe. I do love Europa, Efteling and randomly Terra Mitica (not even sure why of the latter) but PA are still that bit better in my eyes. The theming is stunning, the atmosphere is great, even during quiet peridos, the shows are spectacular and although the stagerred ride openings are a pain, the late opening hours in the evenings are great, even during off peakk periods when the park still shuts at 7-8pm. Also it's one of the best value resorts in Europe and Salou isn't a bad place to spend an evening. There's some nicer, more relaxed bars and restaurants in town, you just have to look for them.