first and third-person RPG combats are an abomination, it can work only if the RPG elements are very well thought out for the first-person/third-person, but I've never played a game that made it work very well.
skills modifying how much damage your weapon does, aiming well but still missing because your character is suppose to be blind, shooting/hitting someone in the face but they are bulletsponge to make skills meaningful are some of the things that make RPG combat feel unsatisfying and
disjointed.it butcher the immersion as well. there is a reason lot of early rpgs were isometric, it just make lot more sense, you only instruct the character they miss or hit on their own. New Vegas is one of my favorite games, but every time I play it now I mod it to strip the RPG elements from combat and make it more realist, more like STALKER, Morrowind is another example, but it's worse with guns than melee.