In my not so humble opinion it's not really a boss battle either. A boss battle is one that requires particular tactics above and beyond the way you deal with regular enemies (i.e. not just shoot it until it dies). Rather than sit here and complain about it I decided I'd make my own version that fits better with my definition. So I present for your consideration a bigger, badder baron battle which takes brains as well as bullets to win. Download link at the bottom of the post.
I've tried to make sure you should be able to work out how to beat the map just by playing it. I will explain how to beat it in the following spoiler but please try without looking here first and let me know how badly I failed on that count!
Spoiler:The map replaces E1M8 (if that wasn't obvious) and requires GZDoom (or Gloome) to play. It should be beatable from a pistol start. There is a little bit of support for different difficulty levels but I haven't done much balancing of it yet. Enjoy!
https://dl.dropboxusercontent.com/u/487 ... nomaly.pk3
Spoiler: Updated to V2