Pretty good megawad. Most maps are balanced on UV and very fun to MAX. The best for me were = 08 | 09 | 17 | 18 | 21 | 27 | 28 and 29. I just found 2 bad maps which were 15 and 32. Definitely worth a play.
Back To Hell Episode 1 is a great example of bad first impressions. The first few four levels consist of odd progression choices that only make sense if you are familiar with playing Doom levels. For example map01 has you enter a room to press a switch that raises bars in the previous room granting access to a switch that raises bars in the first room. I will admit that I almost dropped the wad but I figured I could get through the levels fast, plus the early ones aren't bad just alright. After map04 the level quality increases immensely and I eventually found myself enjoying what I almost discarded. With that said the levels themselves are neither good or bad and if a the mapmakers ever decide to come back to this I recommend touching up the early levels.