I played the first metro and enjoyed it. Not a stellar game (Like Farcry, Halo etc) but a solid FPS. Graphics were good, cool options to have the whole game spoken in Russian (with english subtitles). Biggest problem, the game was too dark. I adjusted my TV to the brightest setting and i did the same with the console, still it was overbearing. This, coupled with the annoying cracking and constant cleaning of your mask mid combat made visuals very un-enjoyable (especially on the hardest difficulty, straight up chaos)
TL;DR Good story line, cool apocalyptic theme and weapons, ruined by low visibility and shoddy combat interface.