Every character is totally annoying and the acting sucks on all fronts. The basic plot concerns a meek teenage boy (Steven R. McQueen, yes, he's related) who is supposed to be babysitting his two precocious-as-fuck kiddie siblings, who have a huge amount of ridiculously complex "comic" dialog that no children would ever utter, and gets hired by a Girls Gone Wild clone producer to take them to the lake's "hotspots". This is after a seismic quake has opened a rift in the bottom of the lake allowing prehistoric piranha to escape. Whatever. I find the Wild Wild Girls angle to be pretty annoying as it's been done already and it was never very clever to begin with. I was over it back when HATCHET (2006) came out, it's numbingly dull plot and characters paving the way for this.
The final nail in coffin is the non-event of the 3D effects. They sucked ass. Most of the time they didn't work. There were weird digital halos and flickering around people and objects, and there were some layering issues where some things that are supposed to be in the back ground appear in the foreground and vice-versa. Nothing comes out of the screen, there is just a little bit of depth in some scenes. This is simply inexcusable. If FINAL DIMENSION 3D can crack it out of the park with no plot and stupid characters, there is no reason, other than a complete lack of talent, intelligence and ambition, for this movie to blow it so badly.