For contex, I have a platinum, played on give me gow twice, about 80 or so hours on total counting both runs.
The game does not have a lack of enemy variety problem, it has a lack of boss variety, it has a bazillion different normal enemy types tough: fast draugirs, heavy draugirs, long range draugirs and the flame sword draugirs are different enemies, and then you have hellwalkers, ogres, revenants (3 different types of them), travelers (3 different variations of them), wolvens, wolfs, those anoying lizard like creatures, night elves (3 different kinds of them), nightmares, those lanter bearing hellwalkers and theres probably more stuff Im forgetting. Theres also a couple of execution animations per enemy (yes the executioners cleave does count).
Having many kinds of the same monster doesn't mean variety to me. For 10/10, you'd expect more. Other games have way more. You don't have to look far.