I actually went to see this twice at the cinemas, both in 3D and both using RealD. As a side note, this is in Australia $21 a ticket and both times I went with my partner so was a $42 experience for us (each viewing).
First time - this was in a Village Vmax http://villagecinemas.com.au/Cinemas/VMax.htm
cinema which are pretty big screens. Watching this I thought it was amazing! The 3D was varied in terms of depth, but was always reasonable to me, and was there for certain during the points where I felt it mattered most. The projectionist at that cinema must be given praise because it was setup perfectly with brightness obviously at the correct level to compensate for the 50% loss due the 3D. The sound in the cinema was also set to the right level so that it was loud, but not hurting or distorting.
Second time - I went to a smaller screen cinema. This was pretty underwhelming, especially since the experience the first time was pretty much spot on. The brightness seemed half what it should be. The sound was (as seems common these days) far too loud, to the point that the speakers were constantly distorting. The smaller screen size meant that the 3D appeared really shallow, and nothing in comparison to the first time.
One comment is that neither times did I notice the extreme anomalies with the conversion to 3D that Neil is referring to! There were times when it was a little flatter then it should be, but overall it was a great experience in 3D. Maybe I've just got so used to the regular customer experience that I don't notice it as much now since I've not bothered with custom 3D implementations in ages due to time constraints.
I think one lesson here is that we really need to learn which cinemas have projectionists that know there stuff, and stick with them!