Critters 2 leans a bit more into the silliness of the series. Not to say that the original was a bleak take on gritty realism, but it did seem to take the danger a fraction more serious. It's not something that works particularly for or against the sequel, it's just a slight change, one that makes sense even. Establishes a real inter-connectivity in the franchise (that Critters would basically hold on to all the way up until that most recent one, which took some pretty wild liberties).
Final rating:★★★ - I liked it. Would personally recommend you give it a go.