Original Xbox What was Your Favorite Original Xbox Title With Online Support?

[Amazon XD]

And don't answer Halo 2! Everyone loves Halo 2, no doubt about it, but I'm wondering what other games you guys really liked on XBL? I know Counter Strike had a big following, but my favorite (besides Halo 2, of course) was Time Splitters: Future Perfect, purely because of the user created content sharing. Players could create entire missions and maps on their own, with full objectives and enemy placement. Some people went as far as making dozens of missions to make up their own storyline and game within Time Splitters. It's a bummer than the servers were shut down, and all that awesome work is lost.

That being said, where the heck is Time Splitters 4?!