My favourite site I ever played at was in the south of Spain. Basically, on the Costa Del Sol, there's a bunch of urbanisations that were built without planning permission and subsequently abandoned when it was realised and the developers were told to stop. One site I went to was an abandoned urbanisation just up from Estepona and it was fantastic. A mix of CQB through the buildings, but also lots of building to building firefights.
EDIT: Found a picture that shows what I mean. I miss that site...
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I went to a 2 day event in the south of Spain in around 2010 where I was one of the only snipers (and I think I was the only one on the first day). The site was a hilly area in the low part of the mountains, which was super cool. Loads of elevation, lots of three-dimensional gameplay; it was fantastic. Our team was stomping the other team super hard, but because I was the only sniper they moved me to the other team for one game where we had to defend a bomb that was chained to a tree, as they wanted a sniper on the defensive team at all times. So we just won on defence and I was ghillied up for my 2nd time on defence, but this time on the other team and against all my friends, which was an issue as the English speakers generally gathered on that other team and my Spanish was... serviceable, but far from fluent.
I set up in a position that watched over the bomb site and the game began. My old team continued doing what it had been doing and stomped our whole team in a matter of minutes, leaving me and one other guy to defend for about 15 minutes. I was super low on BBs by the end, but we managed to hold them all off, with him covering one of the flanks and me watching the bomb. There was even a moment when a group of three on the other team were trying to find me and walked right past my hide I had put together on the side of one of the hills. They walked right along the path about 5m in front of me. Ghillie suits are great.
Funnily enough, my profile pic is from the second day of that event when I got too hot and just went British PMC loadout instead of ghillied up.
As for best players I have played alongside... Well, there's my best friend who got me into airsoft, as well as my school friends who all did it when we were 15/16 at Worthing. When I was in Spain there was a group of guys I used to run with as well who were amazing too. We were me (a Brit), a Scot, a Filipino dude, two Spaniards, two Germans and a Swede; a truly multicultural team of airsofters!