Its not bad at all. You will need to do some hammer and dolly work quite possibly shrink the metal a bit too. Even if you had a perfect replacement panel you would still need to use body filler. Were body filler gets a bad rap is when some clown uses 50 LBS on a dent. The idea is to get the metal as straight as possible then use the filler as little as possible.
Exactly, ******* that fill in a 3\8ths dent with bondo instead of just tapping the steel as flush as possible THEN applying body filler.
Body work is easy peasy lemon squeezie as long as you have an oz of patience.