WEll, "Bad" is said in many ways
there's "Bad" as "Banal" or otherwise uninteresting stuff.
but to be really bad, it has to be ambitious. WW2OL had that. Yeah, it's cool when your 20 feet off the ground, hopping trees and villages that are rushing beneath you.
It's really bad when this, "most realistic of flight sims" kills your for double-tapping the down trim button. Or when the most popular dogfighting move is dragging the enemy over a city, so that FPS make further combat impossible. Or when they start your plane in the hangar and require you to taxi out, with a ridiculous ground handling model. Or where you still can't bail out of anything.
I'm sorry, you can enjoy it, and I'll concede it was extremely ambitious, and that it was a lot worse when large numbers of people were playing that sim. But it's got to be among the worst.