Well that's a hugely subjective question. I love playing Ranger type characters: Archery, One Handed (War Axes), Light Armour, Lockpicking, Restoration, Smithing and a little Speech.
I know loads of people think Lockpicking is useless to invest Perks into, but I enjoy it. Some think Smithing is overpowered, but I don't care, I enjoy using it too.