I don't think he was AS whiny. Sure he complained a lot, but I think the Eddie Brock in the old animated series (from 94?) was a pretty good portrayal.
He complained about Parker, but it wasn't to the degree that he looked like a whiny bitch.
While I have nothing against Topher Grace, I think the problem is that Venom should be superior to Spider-Man in terms of muscles and being bigger in general, which Topher really wasn't.
Tom Hardy as Venom... that could be something, just look at him in Warrior.
But talking about possible future movies, apart from Tom Hardy as Eddie Brock/Venom (which would be badass), I really think Electro could be a cool villain.
Imagine him draining all the power from Times Square or something (like in the Amazing Spider-Man game), and just being overpowered as hell.