I was advised to come here to see a discussion about good and evil and Gollum, but I can't hang around here b/c you guys are talking about stuff I haven't read yet! :)
So, I'll just say this - I do like the way Gollum speaks, and I do have pitty for him - I had pitty for him in the Hobbit and FOTR, but I don't think he's a good character, nor is he like a misbehaving puppy. There's nothing positive about him - even if he does have redeeming moments later on, they aren't redeeming like when the bad puppy licks your cheek and wags his tail happily as you walk in the door, are they? I suspect not, so though I pity Gollum, I don't like him, and I wouldn't want him to be my puppy.
I do LUV the way he says pressssiousssssss in the movie and in the Hobbit cartoon. Excellent! It's like a hiss and a purr.