Disagreed with all of them. If implemented properly then all those elements you mentioned can work nicely in shooters. There are far worse trends in shooters.

For all points, it should be built around the games' style. All three things can be good or bad depending on the game.

Off the top of my head:

Nearly every game having regen health

Limited weapon system (only 2 weapons? Works for some but sometimes you just want a ridiculous arsenal)

Having a single button for multiple functions

Overly heavy focus on competitive multiplayer to the detriment of campaign (i.e sub 7-hour campaign modes, piss poor AI, generic story & characters)

This is the best example of a tps without cover and it demands it or else it would not be a survival horror. 

OP: There are a lot more variety in shooters sonny g Jay. I will school you on you errors very soon.

OP, the problem simply is that the type of games you hate are the ones that sell well, and so thats how the overwelming majority will be.

Personally the tps I loved this gen all sold rather poorly compared to say uncharted, gears of war, or metal gear solid, so their playstyles are unlikely to be copied.

Vanquish, though it had most of the problems you have with tps, cover system, aiming, etc., was just a very satisfying game to play. Gameplay was completely insane and though a bit jerky and hard to control, it was still the most fun I had with a tps this gen. Dead Space is another example of a tps I enjoyed. I do agree that a cover system can be rather annoying. In games like dues ex, uncharted, and gears, I always tend to get stuck to a wall and just start randomly bouncing between walls instead of actually moving like I want to. 

As for fps, biggest problems for me are the very little health, and color pallete of most fps. I absolutely despise everything having no health in an fps. It makes the campaigns extremely boring and repetitive. Maybe once developers actually start focusing on making decent AI, I will be able to enjoy a game with enemies that instantly die, but until then stick to enemies being able to take some damage, at least in the campaigns. I don't mind low health in multiplayer, but not when maps give the clear advantage to people sniping from the distance or camping some corner.

As for the color pallete, I understand a grim color pallete in a game that is trying to tell a good dark story such as bioshock, but if the story is some bullshit crap that makes a straight to dvd action movie seem like a work of art, at least make it nice and colorful, instead of just nausiating shades of brown. I honestly can't stand playing through the campaigns of games like gears of war, resistance, and killzone with their dark grim worlds, just for the sake of having dark grim worlds. Halo also features alien invaders trying to destroy mankind, and yet the developers managed to make most of the world full of color and appealing to look at. 

I would also enjoy new and interesting weapons, though I enjoy being able to only carry two weapons. It makes you have to make difficult desicisons, at least for games that have a variety of enemies. Having even more than one weapon is pointless for all the cod clones where 2 of any type of bullet kills every enemy in the game.

So in conclusion, everyone should just stop copying call of duty and gears of war. Everything doesn't need to look like it's smeared in poop, and enemies should not instantly die unless someone manages to make ai that doesn't act like brainless drones. 

1. The problem is that all games do it meaning no variety. Plus you don't necessarily need to have a game where you search for health packs, a system where you have a limited number of health packs at the start of each level to use at your discretion would work equally well.

2. Glad you agree, lol. I'm also fine for some games like military shooters, but too many games incorporate this system.

3. I find this is mainly for TPS. Take Uncharted for instance; I want to roll out of the way of a grenade but end up taking cover next to where it's landed. Or Mass Effect 3; I want to heal a team-mate but end up taking cover and the resulting time loss means that instead of healing him in time, he bleeds out.

This is especially annoying as I play a lot of games on PC where I have more buttons available then I'll ever need in a shooter.

4. Very few games this gen have a campaign manage to pull any one of the aspects you mention competently let alone well or all at the sametime. Hopefully next gen will be different.