As crew it’s not great either. Staff/crew search is cramped and feels like an afterthought, and cabling to equipment is hidden under plastic humps in the floor which are a trip hazard.
Non-Schengen passport control is down at ramp level with access via an unlit staircase, which is fun with luggage. Crews are then driven to their aircraft, which is pretty common in German airports.
Signage is generally poor, and many passengers board late due to delays at security or difficulty finding their gate.
At TXL crew were dropped off at a dedicated security search entrance, then passports were checked either in the same building or an office round the corner before being driven to the aircraft with no need to battle through the terminal. Much easier!