Yeah, Double Toasted kinda nailed it... they pointed out that he's angry ALL the time. Even before his dad gets killed, he's full of rage for some reason or another. Given that he's the kind of guy who is resourceful enough to reverse engineer alien technology, he should have been more methodical. Yes, I get that he wants revenge for his father's death, but that shouldn't be it. I hope they develop him more in the sequel.