In terms of gameplay mechanics, old school zoom aiming achieves the same thing as ADS. Is getting to press your nose against virtual firearms really that important in a game about shooting werevolves and vampires?
I blame this on the proliferation of Call of Duty over traditional scifi and fantasy shooter franchises. You can fucking ADS on an assault rifle in Halo now
I haven't played a lot of recent FPS titles so I don't know if this has become more prevalent, but I really liked the Rainbow Six Vegas thing of being in first person but then 3rd person when in cover. It lets you see your customized character a lot more. GTA Online had this as an option in the settings as well. I would play FPS but 3rd person in cars and cover.
Also the Army of Two games had 3 things I've not really seen in other third person games that I'd love in a single game (for some reason they kept taking these features out). The first game had a system where if you pressed fire when an enemy was right in front of you, you did a melee move instead, it was a lot more fluid than trying to remember what the melee button was. The Second game had a button you hit to switch which hand you held the gun in, so you could look around corners better, hug walls etc. The Third game had a system where if you tapped the reload button twice you drew your pistol instead, which was good if you got caught mid reload by an enemy.