First, there's a nice SP bonus at the end of levequests now, so it is easier to level solo than it was.
Second, Is this a high ranking gathering leve, and is this one or many? If its high ranking, I'm not surprised that there's 40+ aggro mobs out there. Things tend to get more challenging as they get higher in rank. The placement might not be seen as a mistake at all.
Hate has changed, it is not as messed up as it was before. People just need to have enough common sense to go out and experiment with the abilities available. There's just a little bit of a learning curve involved. I feel that although it has improved, its going to need tweaking along with a lot of other things. It will probably never reach everyone's idea of perfect though, since its impossible to please everyone.
No comment on disconnecting or freezing, as I haven't had any issues with the game doing that.
In all of the years I've been playing mmos, I've never seen one come out with a major patch and not have to do some hot fixes later. Its like when you write a paper and don't notice any typos, but someone who has never seen the paper comes up behind you and sees it right away. A lot of things aren't going to be noticed by those working on the patches, and only brought to their attention once its live.
While its good to point out these mistakes to SE so they can get around to fixing them, its a bit shortsighted to expect perfection as soon as a major patch comes out.
-edit-
Sorry, forgot about the mp comment. Yes, I was running out of mp faster when I first started casting healing spells after the patch. Seemed unbalanced until I adjusted my casting to not spam the same obscene amount of cure spells as I was. Now I'm not having too many issues with it. If you are, try for the time being resting for a bit between mob pulls. Mana regen might take a bit, but a least we have one now. :3