Basically, ghoul adept is giving yourself an enormous, glaring weakness. It's really bad, but of course, only if the GM has enemies try to take advantage of the astral KICK ME sign. Your GM might or might not, I just don't like it, the same way I would like giving someone a Severe Vulnerability to electricity and hoping nobody tries to take advantage of it.
Let me pitch three alternate, similar things:
1) Ghoul Street Samurai: you implant enough stuff (including cybereyes!) to burn out, but of course not enough to die. This wipes out dual-natured, which is a huge help. You wind up with 1 essence and 35 bp down, Sunlight allergy, need to eat meat, and are forced to take cybereyes, but get a bunch of physical stats.
2) Just be a magician, buff yourself (using Sustaining Foci to keep them up) and thwack people. It's very effective.
3) Be a Possession magician, have a spirit possess you and thwack people when you need to fight. Also very effective, and synergizes well with ghoul (since ghoul boosts your racial maximima).