Pros
+ A few memorable missions in the eight new ones you're given
+ Three new multiplayer modes
+ New weapons and a few welcome changes/fixes
+ Great theoretical setting
Cons
- Nothing innovative
+ A few memorable missions in the eight new ones you're given
+ Three new multiplayer modes
+ New weapons and a few welcome changes/fixes
+ Great theoretical setting
- Nothing innovative

Island Thunder is the 2nd expansion pack in the series but it doesn't really offer anything innovative. It has 3 new multiplayer maps, new weapons, and some cutscenes.