They look odd (Dave is a redhead, Weird Ed wears a pink beret etc) and many of the scrolling rooms aren´t scrolling you see everything at once taking away many surprise moments.
Yeah many love Dave´s theme especially. I don´t really find it as catchy as many and frankly it´s distracting as hell. Not as “almost non noticable” as the backround music in FM Towns Zak(which restrains itself just enough).
I compare it to the Phillip Glass scored version of Dracula. It really was meant to be without music.