Halo...played and liked it a lot.
Halo 2...played but never finished it.
Halo 3...played but never finished because despite MSFT saying my save games on my HDD would still be fine after 2nd RROD, my saved games stopped working. Plus I didn't really like it that much.
Halo Wars...shya right like i played that.
Halo 3: ODSTRTDODTS never played it.
Halo Reach... The NPCs in "story moments" don't feel quite as stiff as they did in Halo 3. Dialog writing and voice acting still leaves much to be desired, but so far I'm liking this much better than H2 or H3.
Also somewhat interesting, here in the US Target was offering a $20 giftcard with purchase of Halo Reach. They were completely sold out at the two Targets near me as of Wednesday. The Best Buy (horrifyingly within walking distance of my house) had a huge quantity so no issues there but they also had a $20 gift card free with purchase of Halo Reach. I'm thinking that the retailers may have funded much of that discount in an attempt to lure buyers from Gamestop and from each other.
Anyway, having fun with it so way to go Bungie I guess. $200M US+EU not bad for the opening day of sales.