Most Codices have an auto include unit. What is the Space Marine Auto include.

[YorkNecromancer]

My marine auto is TH/SS terminators, they get **** done.

This.

[DarkLink]

Once they've found a way to break the codex, DarkLink will be happy to tell you which unit is the best according to a blog he read

I don't actually read very many blogs. Only BoLS, which doesn't have much in depth tactics stuff, and Frontline Gaming, but I'm buddies with those guys IRL so that doesn't really count, either. You play enough games at a competitive level, and you start to get to know what really works and what doesn't.

[Mr.Pickelz]

An Auto-include for Grey Knights would be the Psycannon...
For regular Marines, I'd say the tactical squad, the versatility of that unit make it good regardless of which kind of list your going to play with. If your including FW in this discussion, then the Demo-Cannon wielding Landraider(i forgot the name) can be a huge threat and top the priority kill list your opponent will make.

Edit: Also, i would say Sternguard in a drop pod would compliment any list a SM player can come up with.

[DarkLink]

I don't think Marines will have any one auto-include, but they will have heavy competition for a certain limited pool of units. HQ will probably be either Tigirius, Khan, or a CM on a Bike, for example. Overall, there's pretty good balance with most units, though a lot kind of got the shaft (BT characters, Chaplains).

[Katharon]

#1 Librarian
#2 TH/SS Termies
#3 Flakk Missile upgrades to Dev marines MLs.

[Occam]

I play Necrons, so my auto-include is the HQ unit. ;/

[Tzeentch's Dark Agent]

My marine auto is TH/SS terminators, they get **** done.

I hate my TH/SS Terminators, they're cursed.

[Aventine]

I play Necrons, so my auto-include is the HQ unit. ;/

This was funny to me because I play my Necrons with an un-upgraded Overlord. He doesn't get off his plane unless someone makes him... (you know how often I give up Slay the Warlord? Never.)

[Cactus]

Just in the early games I've seen, Vulkan and/or Centurions have been in almost all the lists.

[Stone Edwards]

Personally I always include a Tac squad in my SM lists........