Well, you have some good points, and some "personal" issues with the game, as i see it.
Rubberbanding is shit annoying, and me to wonder why i hasn't been fixed.
The monster density, isn't really tho, an issue.. it's more like you didn't get what u expect - and that is fair.
The AH issues you are talking about, i have never experienced myself tbh.. I'm not really a AH guy, but i do use it ofc, and tbh i have never seen or experienced any of those u point out.
Conclusion: Yes, rubberbanding an such issues are really annoying, and really affects the gameplay a lot. Even, i don't seem to personal experience them a lot, but i know it various from player to player, it is a huge problem, which is server side.
But tbh, to me it seems like you just played the game too much and now u seem bored. So i guess it is time to say goodbye or at least take a long break. In the end, it is a hack and slash game, so, you get what u get maybe the drops isn't that providing and seems impossible to get upgrades by yourself sometimes, even tho it happens from time to time (i havent got a self-found good item, which were sellable or usable for myself in over 2 months).
I guess you've heard about the itemization patch, which will arrive at prob november. I might think u should take a look back there
Well, since diablo is a RNG (Random Number Generation) game, which means that out of 10.000 mobs, maybe at one time you will get 20 legendaries, but at another time, these 10.000 mobs will only give you, lets say, 10 legendaries or even less, down to zero if you are really unlucky.
No matter what, it's impossible to not get a decent drop once i awhile, and you should try selling those on AH or use them yourself, if it's an upgrade.
In the end, don't listen to much too the "Crowd" on what you should do - just farm the areas you like and enjoy the game!
Overall, you should just stick to farming.. once in a while, a decent drop will come and you will be excited about it..
@ release a lot of people expected a game, which diablo never have been and should be, basically it's all about gearing = farming. The paragon levels gives a great feeling of progress, while you farm..
in patch 1.0.7 they introduced "Archon" recipes, which had 1 stat of your own choice, these crafts can be great upgrades aswell!
atm, you get most out of act 3 - there's a few "favorited" routes people tend to use - but in the upcoming patch (1.0.8) there will be more mobs in all the other acts (I, II, IV), which makes the more enjoyable playing, instead of running act 3 all the time.. so stick around and wait for the new patch, a lot will change to how people will farm.
I aslo just started again, back from a little break.. i stopped right before patch 1.0.7, so gearing up again and wait for 1.0.8