I feel like Marvel is growing a bit lazy with this whole "Ultimates" thing. It was cool when it started out, but the idea's growing stale. I find it harder and harder to differentiate between the "Ultimates" version and the original version, and I can't help but wonder if the people at Marvel have just stopped caring about what made the "Ultimates" concept successful in the first place.
"Ultimate Fantastic Four #11" has the FF battling an alien life form that previously destroyed Atlantis. Most of this book focuses on Sue Storm and her relationship issues with Reed. She brushes him off, later falls into the ocean, Namor appears, and the very tired love triangle between Reed, Sue, and Namor is revived for the 2,344,235th time.
So nothing spectacular here. If you liked the other "Ultimate Fantastic Four" books then you will like this one. I just wish Marvel would try something more original.