Personally I thought when I bought this game it was gonna be this Titans- epic tanks that are VERY slow but are literally meat shields and absorb it all. They share the tanking to the other classes. Warlocks- magic and super cool RPG stuff and have a lot of regen abilities. Generally make sure that their team is always full health. Hunters- very agile and fast, everything about them is quick and can be either amazing loners or great team players.