The way they've handled 5e in this game (and especially how they have tried to incorporate elements of the DOS games) just doesn't feel good. It's a bit like if they took a car that was functioning perfectly adequately, removed the wheels from the right side and slapped on an airplane wing with propellers. If they'd left the car alone, it would have been fine. If they'd left the airplane alone, that would have been fine (but not D&D). But the two systems just don't work well together.
