Halo is kinda like the marmite of video games, you either love this series or you hated but it's currently one of the most popular game franchises. 

Here what I would score each Halo game:

• Halo Combat Evolved: 5 out of 5
• Halo 2: 3 out of 5
• Halo 3: 4 out of 5
• Halo Wars: 3 out of 5
• Halo 3 ODST: It it was $40 the I would score it a 4, but since it's $60 I give it a a 3 out of 5
• Halo Reach: ? out of 5 (Hopefully a 5, please don't screw this up Bungie)

SP:
* Halo Combat Evolved: 5 out of 5
* Halo 2: 4 out of 5
* Halo 3: 4.5 out of 5
* Halo Wars: 4 out of 5
* Halo 3 ODST: 3.5 out of 5

MP:
* Halo Combat Evolved: 5 out of 5
* Halo 2: 5 out of 5
* Halo 3: 5 out of 5
* Halo Wars: 5 out of 5
* Halo 3 ODST: 5 out of 5

Ja, ich bin ein Halo-Liebhaber:)

halo:CE 5/5
halo 2 4/5
halo 3 3/5

reach: looks badass

* Halo Combat Evolved: 5 out of 5
* Halo 2: 4 out of 5
* Halo 3: 3 out of 5
* Halo Wars: 4 out of 5
* Halo 3 ODST: 4 out of 5

Halo CE- 6/5

Halo 2- 4/5 (I never played online, would probably be higher)

Halo 3- 4.5/5

Halo Wars- 4/5

Halo 3: ODST- 3.5 or 4/5

Halo Reach: looking like 5/5

Halo CE: 4.5/5
Halo 2: 4/5
Halo 3: 3.5/5

I haven't played the multiplayer in Halo 2 but I'm mostly rating the singleplayer for all three games.

Halo Combat Evolved: 4.75 out of 5
Halo 2: 4 out of 5
Halo 3: 4.75 out of 5
Halo Wars: 1 out of 5
Halo 3 ODST: 2 out of 5

Halo: 4.5

Halo 2: 3

Halo 3: 1.5

Halo Wars: 1

Halo ODST: 3.5

Not a huge fan, only really like the first one.

Id say:

Halo CE: 4/5
Halo 2: 3.5/5
Halo 3 3/5 - Just very underwhelming

MP has always been fun on all of em however.