I remember starting a Hunter because they could have pets but got real bored real quick. It felt too easy. After a bit of research, I changed to a warrior. At launch the warrior was the most under powered class.
Solo levelled my way to 60. Took me twice the time to get to level 60 because I kept going on adventures. Made it to Gadgetzan at some ridiculously low level (after many deaths). I also found a bunch of easter eggs before hitting 60 too.
I was allowed to be a DPS warrior in raids and at one point was matching or outdoing Rogues for damage. Used to speed run Stratholme and Scholomance as a fury Warrior because my healers loved the chaotic challenge of keeping me alive.
I had so much fun playing my own way and that probably contributed to why I had such good friends in the guild during that time. I had to quit because the expansions kept adding too much grind and it sucked having all that hard earned gear become pointless every new expansion :(