It's not just you. The problems you've mentioned here are the main reason I stopped participating in this site several months ago. I have no intent to return in the future unless they are worked out (which I'm not hopeful of). I decided to describe what I expected this site would be and compare to what it actually became; while this isn't entirely relevant to the question I think it may provide some useful context.
Early on, based on the definition questions, I thought the questions this site would entertain would not be so much individual "puzzles" as trying to understand the theory and practice behind them. By puzzles, I mean specifically things like the following (not exhaustive):
- Rubik's cubes and other twisty/mechanical puzzles
- Sudoku and other similar puzzles
- Crossword puzzles, word searches, cryptograms, and other linguistic puzzles
And questions on the following aspects of these:
- The strategy behind solving a particular puzzle
- Mathematical theory of the puzzle
- "Practical" questions like e.g. how best to modify a Rubik's cube for speedcubing
- The history of various puzzles
- Very few (if any) questions of the nature "Solve this puzzle: [description]"
To be honest, I was almost exclusively interested in twisty puzzles, mostly for theoretically oriented questions. I have quite a bit of knowledge about higher dimensional analogues of the Rubik's cube, for example. I would not have minded sharing the site with the other topics above though, which are similar in nature. During private beta there were some signs that we were going in a good direction. Sure, the overall volume would have been low if we had gone in this way, but it would have been a high quality site.
Instead, a few new types of questions emerged which have basically completely took over the site. I'm specifically referring to logic-puzzle, brainteaser, riddle, word-problem, lateral-thinking, and other similar types of questions. These are very much "Solve this puzzle" type questions, and they use a very broad definition of the term "puzzle" which was not apparent to me at all when we were in definition and commitment phase. It seems that "puzzle" here means essentially any question (on any topic) which is cryptic enough to not be obvious, but not so cryptic that there are multiple answers, none of which is obviously correct (at which point it becomes "speculative"). So "what did I have for lunch today?" might very well be a puzzle if I chose to include a specific set of facts to make it into one. I find this simultaneously incredibly broad and very confusing. But at any rate, it's pretty clearly not the vision that I had for this site or where I expected we'd go from our Area 51 definition, and most of the questions I want to ask don't seem to fit in at all any more.
Given that this community accepts, and even encourages (by measure of voting), questions like this, it's not surprising how the site has turned out. There's little to no formal expertise or training involved in solving riddles that I know of. What sets Stack Exchange sites apart from Yahoo Answers and other Q&A sites is that the communities here are supposed to be experts on the topic. Without that distinction, there's really no reason to expect the quality here to stay high; it'll naturally go to the same level as most everything else on the internet of people talking about things they don't really know or care about very much. That's what you're seeing happen here.
Rather than trying to stick around and fix the site, I decided just to leave. I'm not interested in the direction this site is heading, and I'm not invested enough in this site's success to care if it fails. For the questions I do care about, many of them can go on Math SE or MathOverflow. Speedcubing questions still have no good home in the network, which is a shame, but there are other sites dedicated to it outside the network and I don't see any indication that such a question would be any better here than e.g. on Sports SE. For anyone who is still around and agrees that this needs to improve, I wish you the best of luck, but I think it may be too little too late to turn this site around and I have no idea how to do it.