Our little kitty is mostly a really good guy. He tracks a bit of litter out of the box, but he really is mostly good with his litter box habits.
The main thing I don't like is that he likes to get up under the covers of the bed after it's made - then he bathes there and leaves clumps of fur (along with the occasional scab, because he has some feline acne that he picks at) and that kind of grosses me out.
He scratched up the furniture in the past too, but since then we put slip covers on everything and I'm trimming his nails once a week too. That seems to be helping him. He has other places to scratch... he just preferred the furniture for a while there.
He sometimes tries to get in your face and in your food when you're eating, but if you tell him no 2 or 3 times he usually gives up.
I complain about him sometimes, but he really is mostly a good boy. He's good for getting his nails trimmed, taking his medicine, getting his shots & vet checks... and he's finally come around and started playing with the puppy. Really shouldn't complain about him too much, especially when I hear horror stories from my friends about how naughty their cats are!