Quote Originally Posted by PrettyText View Post
I finished the first four levels and found them to be fun.

I no longer had fun on level five (Misty Bog) and stopped playing. The level five save I have was in position where I could probably win, but I just didn't enjoy it anymore. It wasn't one glaring flaw of level 5 specifically, but level 5 was just where the difficulty became such that it felt more stressful than fun.
Personally I found the campaign a bit too hard too, with the mapmaker balancing the maps around heavy use of save/load, what I could advise you is to not play this campaign in one go. Play a level, then wait a few weeks playing other stuff, then come back and do another level spread over 2 or 3 days.