Well, I agree with wimseyguy's and akabumper's comments. Since indeliblemind commented they don't want us to feel the need to defend it, I won't. Ok, I will. It was an awesome cache, and an incredible experience. Prior to doing it, we put together a team of about 6 of us (most of whom I hadn't met until that morning) and we not only accomplished finding the final, we got to know each other and formed a comraderie.
Since it was given the highest difficulty and terrain rating possible, I think that the fact that you didn't like it is probably your own fault. Personally, I don't do very many multi's, simply because unless I know how many stages there are and approximately how long it will take, I just don't want to do them. I know other people who just love multis. To each his own.
I think initially your log on the cache and in this forum seemed to be "attacking" that particular cache, but it seems now that you just want a discussion. So let me add (or maybe repeat) to what others have said...
You are a pretty new cacher. I remember the first time I found an LPC (Light Post Cache). I was in the middle of a parking lot, by myself, parked literally 3 feet away from it. I looked in the trees on the edge of the parking lot. I circled around, thinking. Finally it dawned on me, and there it was! What a totally awesome and unique cache! Having now found probably a hundred just like it, I realize it wasn't really that awesome and unique. But for me at that stage in my caching career, it was the coolest thing. The first time I showed my non-geocaching girlfriend one of those, she was equally impressed. She has since showed some of her friends.
There are caches in the mountains. Very high terrain ratings, some with high difficulty ratings. Someday I'll go for these (planning some for next year), but I'm not going complain if a 5 terrain rating requires me to climb some rocks.
There are tons of puzzles out there. Some are very easy. Some are hard. Some are darn-near impossible. I have a couple that I've looked at half a dozen times and haven't solved. Some of them I don't even know where to start. I have never once complained to the cache owner that the puzzle was too hard. I'll get it eventually. Or maybe I won't.
I have a number of caches hidden out there. Some are LPCs. Some are even easier. Some are much harder. I have one that people have commented that they've been there two or three times looking for it before they find it. When they do, they seem to really think it's pretty clever. Some people have DNF'd it and haven't found it. For them, it wasn't worth the effort, which is fine.
I know people who are all about the numbers...They want fast, easy caches. I know other people who just do puzzles. I know people who focus on multi's.
Play the game (yes, it is a game) however you want. Hopefully you won't cheat (yes, there are people who do that, like logging caches they have never found), but there aren't any prizes in the end, so it doesn't really matter. Cache for the enjoyment it brings you. If you don't enjoy it, don't do it. If you start for a cache and you don't like where it is taking you, don't continue.
Most importantly, HAVE FUN!!!