I watched it last night with my son;
I went expecting to be disappointed because of the previous threads (and the fact that i've already seen it in 2d!). In places i was actually pleasantly surprised.
Much like the 3D film Avatar, viewers shouldn't go there expecting the 3D effects to come out of the screen towards the audience. The screen seemed to have a great deal more depth, with characters and scenery cleverly levelled.
You could call it subtle 3D.
The more obvious effects were characters such as the Battle Droids, which really stood out. This worked as Lucas was clearly able to completely reshoot some of his CGI stuff in 3D, this makes me concerned though, that the original Trilogy which doesn't rely on CGI will have loads more tinkering or will be a damp squib.
Whilst at times i was impressed with the 3D efffects (often catching myself looking under my glasses to see how fuzzy things were without them, fairly fuzzy). I did find that at times the images were moving so fast that my eyes couldn't focus in time and a percentage of the background images were often blurred.
I was sat in the middle of the cinema ( which was at 1/4 capacity at 6.pm) and my eyes sight is 20/20.
Overall, an enjoyable experience.
Being sat next to my son (Dressed as Obi Wan), when John Williams and his crew did their thing and the credits went up was a memory for me to cherish. I asked him what his favourite part was, his answer....?
...All of it Dad!
I'm happy i went.