Dustin Hoffman is a really good actor, in my opinion. And yes, Murray's known for his deadpan snarker roles (Venkman, John Winger in Stripes, among many others).

I don't remember seeing him in The Little Shop of Horrors either, but then, I was distracted by the awesome geeky cuteness that is Rick Moranis.

I love Murray in Stripes, by the way. It does help that he's opposite Ramis in it too.