I don't play games much anymore, but when I did, I always had an affinity for RTS games(Command and Conquer, Age of Empires, Warcraft, etc), and Action RPGs (Diablo, Torchlight).
It's exhausting to find games nowadays that don't nickel and dime you to succeed. I like the Kingdom Rush Tower Defense games on iPad when I'm traveling. Any other suggestions?
0AD is pretty good.
Also this game is fully open source and is a great resource if you are learning something like Blender or want to dev a game / side mod in .js ... https://github.com/0ad/0ad