The video game trend I despise the most is the running assumption in new video games that the younger generations can't enjoy slow paced games and that they must make them easier and faster to appeal to them. And one of the reasons I dislike it is because it is actually true but that only goes because we never challenge the younger generations.
Take someone born after 2000 or you could even push it down to someone born after 1995 (I myself am only a 1993 model) and you will have someone who has gone through gaming without ever failing at any task in any game because all of the games have been made to be beat at the first try effortlessly so that the audience won't feel discouraged and leave. And people of the younger generations will look at reading in a game as a chore, no matter the depth it may bring to the game. And the graphics must be as realistic as possible to a point where even artistic games that don't have the goal to be realistic like Okami get ignored.
Throw me another slow paced game where the power of your mind is valued more than the speed of your trigger finger. Make me have to drudge over a map peering into the landscape for landmarks so that I can find my way. Allow "monsters" to hold true to their title and make me fear encountering them, let me struggle to escape the nagas many armed grasp rather than have me swipe down 100 nagas at the touch of a button. Give me strategy game that are not "real time", ones where being able to calculate terrain speed and the difference in tiles and your speed over certain tiles is more important for your victory than being able to quickly command three seperate entities on the map at the same time to perform a flanking maneuver.
Make me think, not act, please!
Now when I try to introduce my brother born in 2000 to the kind of games I like he finds them boring because he loses and because he has to read and things go slowly. He doesn't want to spend time making sure his armor is up to shape or to stock up on some necessary supplies before heading carefully out of town. He wants to storm on a DLC mount with full armor and power given to him at the start of the game to the end boss and beat him on his first try after killing a thousand of his minions at the same time by himself. And then he wants the legendary weapon at the end of the game or the whole experience won't be worth it, despite the fact there is nothing to challenge him enough for him to actually need the legendary weapon.
So yes, this constant dumbing down content to sell things better is the trend I despise the most in the video game industry.