Multiplayer games (especially MMORPGs) that avoid multiplayer as much as possible.
Recent MMOs did so much that just screws over the social aspect, I consider it really questionable why they even did a MMO in the first place.
TESO for example that (at release, don't know if it got better, stopped 2 months after release) did everything in its power to make group play miserable. Barely any quest progress sharing, and even what it had was questionable at best (okay, last kill-quest shared... the follow up quest is also kill based but doesn't... why exactly?), you could lean every crafting skill so you never needed other crafters (except to exploit-level runecrafting), if you pick the wrong conversation option with an NPC you'd become unable to play together for the next hour...
There are more examples in other games.
Dungeons that have a solo option that is exactly the same (in loot and design) as the party one, just easier. Or games that are so easy that you can even solo the party content without too much problems.
Or games that don't even have party content until you reach the level cap (thats mostly an eastern MMORPG thing).
Or games that focus on, or introduce, so many solo player features that have almost no impact on multiplayer (ingame trading card games for example, or pseudo-pokemon battles that sometimes don't even have a duel option)
Tutorials that treat me like I'm an idiot, but don't teach anything that might be worth teaching. Especially if they can't be skipped.
Yes I know that I can walk forward by pressing "W", and even if for some reason I didn't there is a control chart in the DVD box. Which also teaches me the basic controls about 30 times faster then any tutorial ever could.
And why does "insert unique semi-complex mechanic here" only get a small, easiely missed, popup and nothing more when you wasted 5 minutes on telling me that spacebar makes me jump anc ctrl makes me duck?
People/devs that think splatter=horror.
Monsters that jump out of air ducts and explode into gibs on death are hilarious, not scary. Stop trying to sell comedy as horror.
Female "armor" that makes her end up in a swimsuit.
I absolutely can't stand it when I'm playing... well anything... and heavy female armor contains less material then the thing my girlfriend wore at the beach last year. It just looks silly.
Boring "overdesigned" armor.
There is a point where you have put so many skulls, spikes and glowy bits (which are pretty overused and boring already) onto your armor that it stops being creative and ends up being bland again. Putting on even more skulls, spikes and glowy parts only makes it worse.