This is totally a “fluff” movie: more comedy than horror and probably a guilty pleasure for many, as it does have some good laughs and is utterly mindless. That’s not necessarily a knock - I’d describe one of my favorite horror movies of all time, Army Of Darkness more or less the same way. Where they differ is in the performances and effects, mostly. Infestation has decent acting but it’s done in such a campy way that it’s hard to tell when the acting is real. And the effects... well, I’d put this on the very high end of SyFy studios CGI efforts. Sometimes they pull it off, most of the time they don’t.

Just fine to pass the time or watch when you’re doing something else (your brain can handle this plus anything else), and it’s genuinely fun at times and even really funny once or twice.