Some of the parts look surprisingly pretty professional and appealin', like the buildings texture, and the composition of the "Under Construction" parts.
Some parts look quite awkward to me, like the SS Central Station (i might not be that surprised if Waffen-SS would be there in the next update), altough the Shaggy slows down a lot inside, which look a bit out of place..
The runnin' being slower than regular speed might need better execution and context..
Also, when Shaggy enters some dark garage or something like that, the slower walking might be better with proper animation (+ crouch)
The part of Kung Fu Panda surprisingly got me though, and it would be noice if it was extended, perhaps with some interaction..
Then i would recommend to polish more the Mystery Machine texture, and play a bit with the lighting..
(The networking default UI and the blue cube with instructions obviously as well)
I also can't get near enough some buildings..
Some aspects felt like an official Scooby Doo game, so it would be nice if the official look of the early charming 3D SD games would get properly mixed with some weirdness..
Also, i hope that the critique wasn't a bit annoy-full at times..
^w^