Currently doing a long awaited co-op replay of the game with my best friend from high school on PC, and so far most of what I remember liking about it holds up really well. The writing is painfully 2009 dude-bro dogshit but it's the only Halo game to have such an amazing sense of atmosphere, and the music is easily the best in the franchise. Genuinely justifies itself as a spinoff because it doesn't just play like the mainline Master Chief games--if anything I wish they'd taken some of the stealth/open world ideas present here a little bit further, either in this game or a future one. Unfortunately it was just never meant to be and ODST remains the weirdest and most experimental the Halo franchise ever got and it's better for it.