Reg is charismatic and charming as well as shy and introverted, which generally makes for an interesting performance. That said, the depths of his neuroses just aren't credible for someone living in a utopia like Trek
's. For one thing, it's hard to imagine any kind of military officer being that awkward and bumbling, but I'll even put that aside. I'm an introvert and a quiet guy myself, but Reg needs professional help so obviously that I simply don't buy he wouldn't have gotten it long before his TNG
I enjoy and like the character, but he always takes me out of the given ep to a degree. Harry Kim was a more believable wimp for the setting - somewhat awkward and not particularly popular, but not a social catastrophe with legs.