One "plus", however, is that others must share my questions about using bland (but "name") voices for animation. Except for one or two second- or third-tier "stars", most of the voices are from "haven't heard of them" folks, which I think is a good thing, as this means the roles are cast for the voices not the hope that the name might sell a few extra hundred tickets (why use Kathleen Turner, for example, if the character she's voicing speaks maybe a half-dozen words???). Perhaps the exception here is the John Heder character ... I've never seen anything he's been in, but I guess he's used here a bit like how George Carlin and Cheech Marin were used to carry their "type" in Cars.
Despite the negative tone of the above, Monster House is reasonably engrossing and entertaining. Despite their rendering, one can care about the characters, and wonder about their thinking/development. Despite a few "cognitive gaps" here and there, the story has a certain congruency which is not undone by it's (amazingly, unexpected) happy ending. Maybe my opinion is tainted by what has become the "standard" run of in-jokes strewn across movies like the Shrek films, Cars, etc., which are generally credited with keeping the adults interested (and I sort of did miss that "level" in this one), but, to the filmmakers' credit, they kept their story to the story and didn't plaster the whole thing with pop culture references. As I noted above, if you're looking for something in the PG range, this is a good one ... if you want something "edgy" (although, frankly, there were some reasonably scary bits in this), you might want to take a pass.