I mean, you're literally supposed to hate Venkman at the start of the first two movies. He's an utter creep in the first and a total fraud in the second. And then you slowly get invested in this creep guy becoming not one.
note Winston (the everyman) never does anything remotely iffy in either
All of the 3 original Ghostbusters are *supposed* to be weird. You get an intro to that super fast (Venkman's a creep, Egon tried to drill a hole in his head, Ray let Venkman take out a horrible mortgage and got suckered into buying a rustbucket). Winston's there to stress "these guys are weird"
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note Winston (the everyman) never does anything remotely iffy in either