1) Green surrounds that due to overwatering turn into soupy marshlands that a ball cannot escape from when trying to employ the ground game.
2) Growth of fairway rough so deep that much of the round is spent looking for balls a few feet off the fairway. Generally such practices are regarded with pride by the membership however.
3) Greens that are not rolled frequently enough and create the magical bouncing ball that will only find the hole if lucky. I don't care as much about the speed, but I hate to see the ball bouncing all over the place when putted.
4) This is more of a golfer maintenance issue, but not raking bunkers or properly fixing ball marks (or feet dragging on greens for that matter). This has become so much more prevalent an issue over my golfing life. It is so easy to leave a course in better shape than you find it nowadays, because you can fix multiple divots in the fairways, ball marks on the greens and unraked bunkers on pretty much every hole. Public and private.
5) While it is common on here to speak about greens speeds becoming to fast to handle the contour of the greens, I've found it at least equally as common to find green speeds too slow (or maintenance too poor) to bring out the nature of what the architect intended on the greens.
6) I too dislike the practice of surrounding bunkers with deep rough. I'll bet this is the minority view of golfers in the US in regards to this however. Most are pleased as punch their ball stopped short of the bunker. And if the lie is poor, well you can always just fluff it up.
7) I've come to dislike massively hairy bunkers, but around the lip or on a tongue extending into the bunker. I'm talking about dense grass a foot high where it takes a search party to find your ball. Bunkers are hard enough as is to have your ball be damn near unplayable in the lip of one. I do like the look of them however.
Lack of something resembling consistency in bunker sand. I don't need perfection, but I don't like it when there is almost no sand in one bunker and then the entire sand from the Gulf Coast has been imported and stuck in the next.