The baseline

If a mob/animal mod is BETTER than Alex's Mobs, thats a good mod.
If a mob/animal mod is WORSE than Alex's Mobs, that's a bad mod.

Alex's Mobs is the baseline. Not amazing, not terrible. While it does add some cool animals, it seems focused on quantity > quality at this point. They could work on making the config simpler, they could work on configuring the mod better so I don't have to immediately start tweaking the config, they could work on improving the current animals and textures, but they seem to be focused on adding more mobs instead.

One big problem I face is their spawn frequencies. A weird bug or mob will spawn frequently, while the more immersive and realistic mobs rarely spawn, or will spawn in weird places or in weird group sizes (too small or too big).
Of course, this is all customizable, but with 85+ mobs, it takes hours in the config just for it to more polished and more immersive. Also, the newer mobs seem to have little info online, which makes config-editing even harder.

I think if their config was better designed and more set-up from the start, I would increase my rating. The fact that I have to start tweaking a ton of config files in the big 2026 and have to think about a lot of weird new mobs with little wiki info is not great.