To be honest, I like all of the classes, but the Warlock has some awesome abilities. The Sunsinger subclass has opportunity to do massive grenade and melee damage with Radiance, since it drastically reduces cooldown speed. You can toss about 6-7 grenades every Super, and Force Shield helps keep you alive in tight spots by using melee attacks. Keep in mind that you always want to toss a grenade before you activate radiance so you get an extra grendade toss. Boosting Discipline also helps you recharge grenades super fast. Glide is also my favorite jumping ability out of all the classes. It just feels so fluid, and it gives you lots of control to get out of tight spots when necessary. Also, the final upgrade in the Sunsinger subclass lets you toss 2 grenades, which is really nice, but each grenade has it's own cooldown. One thing it doesn't do that I thought it would is double the amount of grenades you can toss with Radiance. If your grenade is fully charged before you activate Radiance, you basically only get one extra grenade toss, but that's still pretty nice. Overall, having two grenades outside of using Radiance is awesome. I haven't fully upgraded Voidwalker yet, so I don't have favorite abilities or strategies with that subclass yet, but I can say that Nova Bomb is excellent when used correctly.