The DBE is a pretty ship which will fool you into thinking it can do things. While it can be finessed into and out of many situations, it is not because the ship itself is good.
ADVANTAGES
cool running = can slot rails better than most ships (can't use them effectively, see below)
med-high armor = might be able to jump away if you're fast and prepared
can ram smaller ships
has a class 3 hardpoint, however it's really a class 2 (see below)
WEAKNESSES
Weak shields = can't trade blows with larger ships
Slow turning = impossible to hit small fast targets
Slow turning = requires turrets which reduces dps. (Turns the class 3 into a class 2)
Slow turning = can't hit small ships with rails or other slow firing weapons
low boost speed = can't run away, you won't be chasing any CMDRs down
limited compartments = less room for SCB