I'm surprised anyone misses the old shadowflame. It was so annoying because it was a dps increase but required you to be pretty damn close to melee range which was a huge hassle on some fights. That expansion was a dark time for this class. Anytime I think something about lock sucks nowadays, I just look back at how fuckin bad it was in cata. I think ToT era warlock is the best I've ever seen this class.
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Yeah patchwerk ritual of forcing everyone to summon a doomguard, rank 1 life tap spam to stack illustration of the dragon soul pre pull, then going to town. Also remember when 4.0 came out and the destruction rotation used 3 different fillers between soulfire incinerate and searing pain... this class was totally alien at different points of this game