Dragon Age: Origins gameplay and discussion thread.

[Monk]

I found Sten one of the most interesting characters....I mean he was done far better than the Krogan in ME.
Morrigan was nice and mysterious, but I found Sten better.

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I can never forget what he liks most about Ferelden.....Cookies?!
"You have these small sweet things here, we have no name for it...."
"....Something must be done about that"
And the scene with the dog, at the camp. Sten was the only companion who actually took a fancy to the dog.

I disagree, but I am heavily biased. Wrex is my all time favorite Bioware character, but I do like Sten.

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He strikes me as Canderous (from KOTOR) without all the war stories, he's definitely a man out of place in Fereldan. The scene with Dog was priceless, however, I never would have expected Sten to bond with him. If you recover the Qunari's sword, they have more dialogue together.

As for Morrigan:

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What is even more interesting is if you don't agree to the deal.

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She leaves and heads to Orlais, managing to join the court of the Empress.

I think its safe to say no matter what ends up as the canonical ending for DA:O (or if they take a ME2 route, now THAT i'd love to see!) Morrigan will play a big role in the sequel.