Here's what I would score each of them.

• Halo Combat Evolved: 10 out of 10
• Halo 2: 8 out of 10
• Halo 3: 9 out of 10 {Only because of the multiplayer, the single-player was good but the story was sub-par and we finished the fight too fast.}
• Halo Wars: 7 out of 10
• Halo 3 ODST: 8 out of 10 {I would've scored it a nine if it was priced at $40, but the campaign in this game is so much better than Halo 3's.}

I think you're pretty much spot on. But I'd give Halo Wars 8/10.

Humm, I will score the ones i've played so far

Halo CE: 9/10, The best story in a halo game, and overall one of the best Sci-Fi stories in a game
Halo 2: 10/10, The best MP in a halo game and the story is almost on par with Halo CE
Halo 3: 8/10, It was average in Halo standarts.

Haven't played Halo Wars and Halo 3 ODST yet.

I've only had chances to play Halo at a friend's house. I've never played it in depth but here are my ratings.

Halo Combat Evolved: 9/10
Halo 2: 9/10
Halo 3: 9/10
Halo Wars: 5/10 (Absolutely sucked big time.)
Halo ODST: 7/10

Halo 2 had the worst multiplayer in the series {Not counting Halo Wars}, weapons were either underpowered or overpowered and the hit boxes were so big that it made it easy for n00bs to score headshot kills. Halo 3 fixed all the issues with better weapon balance {Although there are minor imbalances} and over larged hit boxes were taken out.

However, I say Halo 2 had the best storyline... until the ending. Halo 3's story was worse but the ending was good, how that works is beyond me.

Halo CE: 10/10
Halo 2: 9/10
Halo 3: 10/10
Halo wars: 8/10
Halo ODST: 9/10

Halo Combat Evolved: 9.7/10
Halo 2: 9.2/10
Halo 3: 9.5/10
Halo Wars: 8.5/10
Halo ODST: 9/10

In b4 "gaylo sux" comment.

halo: 8/10
halo2: 8.5/10
halo3: 8.8/10
wars: 7.8/10
odst: 8/10

Halo: Combat Evolved- 9/10
Halo 2- 10/10
Halo 3- 9/10
Halo Wars- 8/10 (Only played it briefly)
Halo: ODST- 8/10