Yeah you played some of the better games that are on there.
Puerto Rico is worth checking out since it's one of the 'new classics'... Some people claim it's a solved game. I don't believe that.
Stone Age is a very good introduction to Worker Placement mechanics.
Keyflower is another on there that you should definitely try at least once.
Through the Ages is a masterpiece, BUT, it's using the old version. There's an updated version that's called 'Through the Ages: A New Story of Civilization' that fixes the problems with TtA (Military becomes not as brutally backbreaking, some of the specifically broken Leaders/Wonders got fixed.) It's Still a good game, but it can be very unforgiving if you screw up somewhere. Give it a look and try out Simple variant. It's definitely not for everyone though, so if you don't like it, that's perfectly fine.
One of my favorite things about the site is that it frequently has links to the rules for whatever game is on there.