I'm also really glad that they had a serious tone with #10.
All these recent trailers were getting me a little concerned over the tone of the movie. With all the loud, poppy rock tracks playing in the background, dialogue exchanges like:
*"You should go back to school", "You never should have left"
*"I hear you're quite the animal" "Look who's talking"
*"You're a guy Bobby, your mind's only on one thing"
I was getting a really bad Fantastic 4 vibe from all of it.
But the TV spots like 1-5, 8, and 10, and dialogue like:
*"I came here for Jean, I'm not leaving you without her"
*"We stand together, X-Men, all of us"
fill me with the confidence I need.