Jolly, I never came upon the idea to leave the Necro areas - I fought and left via crystal. I didn't even use these BF that much. Though I did Act 2 in this case => as soon as I had all keys, so I wouldn't trudge in several times.
My XP => one dungeon was empty, but the boss monster was there in the 3rd lvl. And I had 3 boss monsters at the same time in my 1st dungeon in the end level.
Act 3 => in earlier versions (not your sell version) 2 dungeons totally empty in the 3rd lvl, but a lot to amuse myself in the higher ones. 2 boss monsters in my 1st dungeon.
I think this generating procedure makes it difficult - but I'm a quest not a monster-slash gamer, so it didn't bother me. I don't feel offended <img src="/ubbthreads/images/graemlins/winkwink.gif" alt="" />
In case you wonder => I played the game from German version 1.00 on. There have been a lot of fixes and changes already. I'm sure, the Larians will do more about this.