Good watch, might watch again, and can recommend if you like horror / sharks.
I imagine for someone who doesn't care about sharks, this might actually be a little boring. They're used really well for a horror mechanic, there is almost a Rob Zombie vibe to this one.
The weirdest part of "sharks in a lake" is how the sharks are surviving, or if we believe the movie discussion that it's a "salt water lake". There are lakes of weirder stuff, so a lake of salt water is reasonable, but it is very clear when you are in salt water versus fresh water.