Halo Reach is the first Halo game I've ever beaten.
I'd tried playing the original halo back in the day, but couldn't ever quite find out what the fuss was about. I bought it used and got to the planet, but lost interest and stopped. Then I was going to try it again, but for some reason the game would never load again.
I might try the original again in the 360 to see if it will work.
Halo Reach was pretty solid. My only real complaint was the fact the music was so loud I couldn't hear half of what the characters were saying, and even when I switched the subtitles on, they'd only play half the time.
Could be because I'm a 360 noob and I'm looking in the wrong place to adjust those settings.
I haven't tried multi yet, only the campaign.