What I love about Fringe is that it's not borderline scary like the X-Files, but there is a lot of intrigue and much more science than mystery... although there is mystery, it's more relational than scary... e.g. Who does this guy work for? What does this company REALLY do? as opposed to e.g. What the heck alien is in that meat locker?
P.S. Who else thinks Walter's wit really completes the show? Love that character!