The player built a human "dex" barbarian, with Dex and Con the top two attribute scores to maximize the unarmored defense bonus (AC 17 at level 1) and take half damage when raging. He wields a rapier and a hand crossbow, and took the crossbow expert feat so he can have a bonus crossbow attack, and ignore loading. The first night of gaming, he was making two attacks every turn. I feel that this build is not in the spirit of a barbarian, and I've since figured out the crossbow expert feat wasn't being used properly because of the ammunition limitation rule.
I've asked him to convert the character to a fighter so the character makes more sense and is more balanced, but I'm having second thoughts now. Was this a fair request, or should i just let it play out? I don't want to be overbearing, but I want character creation to make sense and roleplay to remain important.