For Me Its SP

I really dont have a favorite. I like having a great SP and MP like uncharted 2.

"only a developer who implements both features inside of a game whose very SP/MP components compliment each other so well and transition between each other so seamlessly, reserves the right to be accredited a winner. Many titles execute this technique very well in fact."

I was more interested to know what games/devs you believe to incorporate both of these components seamlessly.

Imo, I've always been a supporter for SP gaming. Regardless of the fact that my favorite game of this generation is probably so because of it's co-op multiplayer. SP has been getting kicked in the back seat as time passed.

I'm all for MP, but it seems like MP is holding back the SP categories indirectly.
There are genre's which are completely BUILT around single player experiences. I know some of you may disagree, but action and RPG genre is much better suited to the SP category. But w/ the increasing popularity of MP component in gaming, the games that 'could have been', never see the light of day.
Each developer/publisher chooses only so much to invest in SP-only games. And it's not their fault.
SP-only games have come down to rental-only status unless it offers more than 60hours of gameplay. Regardless of quality of the title. Now you are seeing hybrid games that are incorporating MP mechanics into 'SP-only genres'.
Demons Souls is a game I like to bring up again and again.. It did MP perfectly from a action genre standpoint. But, it was clear to see how the SP was lacking in the overall sense. The experience you get from DS is no doubt amazing. But if it was an SP only experience, no doubt you would have remembered the game quite differently.

Games like WKC and Borderlands would be extremely lacking were it NOT for the MP component. But as you can see, as I list these examples, it's hard to say that the two components supported each other.
It's either the SP is the saving grace, or vice versa.

Ofc, some people do argue that there are exceptions, But I beg to differ. The affection of the game leads you to believe that the game has flawlessly implemented MP and SP.

I can't really recall a game at this point where I said 'This is the complete package
I do not feel like I lost something that could have been because they decided to inlcude both MP and SP'

Now, I'm not saying that MP only or SP only are always quality titles. By far from it.
But i'll stop here. I think I went on much longer than I expected.