It is not the underwhelming kind it is like fading black and looks like they run out of money or time to do it. When you think the final battle gets really awesome because a tread as dangerous as nothing seen before emerges it ended.
While I am at it my other mayor complaint is the climax. Nothing wrong in general with them but they never have the impact Bebop and Rocksteady would had. A bit later I learned that they created new characters named Tokka and Rahzar. I remember thinking as kid how different they look from the the TV series.
When we watched the movie most of us ignored the fact that the new characters were not them. Why were Rocksteady and Bebop not used or introduced here. The Ooze is a fitting connection to my first problem. A mutagen that created the Turtles and can be a potent weapon in the wrong hands. Like the title said it is centered around the Ooze. Some time has passed and the Turtles must adapt to a new situation and old enemies want revenge while new ones will appear. It continues the story from the first movie. While it is still entertaining it is weaker while also doing some things better. Some time has passed and the Turtles must adapt to a new situation and old enemies The sequel is more lighthearted, goofy (mostly the good kind) and uses more humor. The sequel is more lighthearted, goofy (mostly the good kind) and uses more humor.