I believe it is the first time any Halo game past Halo 2 (not including the RTS games) is release on PC. This means you can now play halo 3, ODST, 4, and Reach in 1440p+ resolution, 100+ FPS. The online is back too so right now there is a pretty big group of gamers online. you don't really have to worry about joining games as it tends to find player pretty fast.
~Now not everything is great, some of the early Halo games have not aged well in my opinion.
~Halo 1 aged the worst and have the worst levels as well as the worst final escape sequence i've ever played. The vehicles control like total garbage in that game. Also the first half is great but the second half becomes really boring and repetitive, with stages going on and one forever which feels like an easy way to make the game longer. It was totally unnecessary.
~Halo 2 is better but the online is rather bad now since the weapons kinda suck. Also the story is good but it ends very suddenly and anticlimactically . The stages are shorter but there is still a bit of "filler."
~Halo 3 is a lot better and there isn't much to complain about. The final escape is way better than Halo 1's.
~Halo 3 ODST is BAD (the main campaign is extremely lackluster, with stages that are uneventful and just boring to play through. It just builds up to the final 2-3 missions)
~Haven't gotten to Halo 4-reach campaigns yet.
Overall I got it at a cheap $25.00 and it was worth it.
9/10