1. The hunter association might be somewhat crappy here, since MC got coerced into this... Or MC is just dumb and really just went into a dungeon with that guy...
2. Made a decent downside for the copy skill, and then immediately discarded the idea for the OP easy 100% chance ditto skill accumulation = solution to all problems version.
3. Recycled the old "Family member in a coma, needs an elixir" motivation.
4. Neji was right, talent is ultimately the deciding factor for success in these worlds... MC is probably the reincarnation of one of that vampire lady's friends.
5. Didn't get one shot by level 80 Fenrir at level 4??? Maybe it's because this one is the vampire lady's pet, so it's not trying that hard.
6. Requiring physical contact to activate a skill isn't a huge weakness, plus it works through equipment! So really he should test if throwing weapons work, and if they don't, he should still use ranged weapons anyways but attach a wire to all his projectiles, so that he can copy skills through the wires. If he can't or won't, he should get a dang shield! He's not doing the fighting anyways! Plus, a spear's better for a beginner.
7. No exp distribution - How do other supports get exp, then? If everyone's an damage dealer, then he should just go solo at some place with, like... Rabbits, slimes, or skeletons.
8. Tamer. If this guy tamed any monster with a useful, spammable skill, he could just have it in his pocket and constantly use [Imitate] on his pet, and fire off the 1-use skill over and over. Physical enhancement buff skills would be great.
Conclusion: Boring