No feet/shadows in first person. It just bothers me a lot. There's nothing that can break the immersion in a game more than looking down and not seeing your feet, because apparently your legs were amputated and you have to hover around with your mind. <_<
Ah, yes, that one's especially baffling because with some things I don't like in games, I can sort of see why developers would use them, whether for technical reasons or because they think someone actually wants that, rightly so or not, but for this, I just don't see any reason NOT to do it except laziness, it's not like being able to see that you're not just a floating camera with arms attached in first person takes anything away from the game, on the other hand, it's a simple thing that can make it a lot more believeable, yet so few games actually do this.
And another thing that bothers me, Call of Duty style health systems, in other words, doing away with health bars, and healing items too, usually, and instead having a bloody screen indicate that your low on health and having health regenerate. Really, what is it that modern developers think is wrong with health bars or health pickups? And saying "they're unrealistic" is a poor excuse, because I hardly think it's more unrealistic than having your health rapidly regenerate when you're under fire, I mean, that part might be justified by the game's story, like in Crysis, I don't think it was ever explained in the game but I always assumed the health regeneration was because the nano-suit was able to treat injuries automatically, but of course, that game DID have a health bar, it just regenerated automatically rather than using first aid kits or something like that for healing. In games like Call of Duty on the other hand, there's no reasonable explanation for your rapid regeneration, since your character is just a normal human being and the game has no supernatural or science-fiction themes, now, first aid kits that instantly heal all your wounds are also unrealstic, but I can more easily suspend my disbelief on that than my character apparently being able to recover fully from getting shot in the head without any medical aid within a matter of seconds with no explaination given for this, and the bloody screen? It's not really that realistic either, I mean, the only logical explanation for it is that blood gets into your eye, and why would that happen if I got shot in the leg? And besides, while I don't recall ever getting blood into my eyes before, I'm pretty sure it wouldn't look like you were viewing the world through a video camera and blood got onto the lens, that would only make sense if you were wearing goggles or a helmet with a transparent visor, yet it happens in games that give no indication that you have anything like that on too, further, it's annoying, when my character is wounded, I want to be able to see clearly so I can avoid damage more easily, yet the bloody vision serves only to obscure vision, and it gives a less clear idea of your condition than a health bar too. Let's not forget the fact that games that have this often still have other interface elements that are no less unrealistic than a health bar, like a crosshair and an indicator of how much ammunition I have left in my gun. So it seems not so much like developers are doing it for realism as that they just have some sort of irrational aversion to health bars. If you're going to abandon tried and proven game concepts for the sake of "realism", then actually make it realistic. Also, you should come up with a replacement that's better, otherwise, bring on the health bars I say.