I always use the mortar kit on my main build and am traited to make full use of them. Are they the best? No, but I love it anyway. From time to time I switch to others and use them too because I feel they're a core part of the Engineer.
Favourite: Engineer.I'm a Sci-fi fan over fantasy so the Engineer was a natural choice. Lest Favourite: Revenant.Just never found a way that I like to play it.