I know that you mostly came here for MY opinion
I watched it on Friday and, as a somewhat uncritical fan of both Tolkien and Jackson's version of Middle Earth, I really enjoyed it.
Certainly more taut than it's two predecessors, with more storyline and less pointless running about, it pulled things together nicely and - in my view - retained a lot of the book while doing so.
A lot of people seem angry with these films for not being something that they could never possibly have been - the Hobbit is not the Lord Of The Rings and so the films are not going to be similar. They've done a fair job of taking that story into the more fully realised world of LOTR and made two enjoyable films - that probably shouldn't have been three - in the process.
The actors did a great job, the story was well told, the CGI battle scenes mostly made way for relevant character storytelling, from where the previous film started, this was pretty much an ideal ending.
Basically, if you found the previous films passable to enjoyable, you will probably like this one a little better. If you found them intolerable, then this really isn't for you.
So now that we have Tolkien out the way - and I really hope that we have - what are the odds of seeing some more recent fantasy get a cinematic treatment? Surely these films - and the GRR televisations - have shown that there is a market?