This is the good old Bloodpack and ZBloodpack for Doom2. The maps are the same in both mods, but in ZBloodpack are new monster, weapons, etc.
One of those old Doom mods which you remember to be good, but in reality, is actually mediocre. Lots of ripped content from other games. Plenty of bland ugly maps which have you running backwards and forwards across the same area time and again. Some good enemies, some bad. Most of the difficulty, if any, is derived from poor monster placement or item distribution. There's some nice maps and enemies and this mod did inspire plenty of other wads and monsters (not to mention some nice guns), but it's probably best left as a footnote in history. Bloodpak is very 50:50, play at your own risk.