Warlock
My first character was a Titan and he was OK, my second a Hunter who I loved more than my Titan. I never made a Warlock because I didn't like them. I just knew I didn't. That was until recently.
I made a warlock and leveled him to 40 and love the class especially Stormcaller it's just so much fun for PVE and can't wait to use him in PVP/IB.
Was there a class you disliked and then loved after you gave it a chance?
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Voidwalker, it was the first class I leveled up my warlock and I remember no one would raid with me for it so I figured it sucked cuz I couldn't selfres but I love using nova bombs