Mage. Iam mostly interested in pve so playing such a plain class is not for me.
Druid and Paladin, altho I did eventually get the itch to *try* Pally, because I wanted to see how different they were from what I remember in Vanilla (vs. WotLK when I first tried the class). Both classes bore me. Paladin is overkill imo & I kill things so efficiently I feel no challenge. Druid for some reason bores me even more haha. I honestly am not even sure why, but it was always the only class I was entirely apathetic about the entire time playing it, not just bored.
I actually like paladins for that "no challenge" reason because it allows me to make challenges for myself. Killing 1 mob in a 1v1 fight is boring because 99.9% of the time it's no sweat at all. So I like to see how many mobs I can wrangle and kill before I need to pop my shield and some other cooldowns.
Druids I absolutely love because I can fill any role. I especially like this because I hate being a dps only class and searching for groups for hours on end trying to find a tank. When you're a tank you can easily pick and choose when and what you want to run. And I love me some bear tanking.
Druid.
It was my first high lvl character ever to reach lvl 56 in BC, and I hated that I was the ultimate underdog. Rogue was a better meele, mage was a better caster..and also hated that the whole shapeshifting thing. I picked this class out of the blue knowing nothing about it back then, and left it at 56, never to look back at it again.