I bought a 5.2 after due deliberation, much like yourself I assume.
Got a lot of help from the people on this forum, they are an excellent bunch.
First you need to be brutally realistic about what you are going to do with this boat. Its not what you INTEND to do with it, but what you are actually going to DO with it that counts! Get that cleared up first off. IE will you race, get a boat with a good local fleet.

I think my 5.2 is excellent, but coming from a (racing) keelboat I am used to having underwater appendages (like daggerboards on a 5.2) that can badly damage the boat when grounding at speed. If sailing in an area with shallow water and lots of nasties under water, you might want to consider a boardless design.

The Nacra 5.2 itself is about as gentle as it gets. Not too quick to fly a hull, which is either frustrating (to a pro) or reassuring to a catamaran beginner like me. Precision steering due to the daggerboards is truly excellent! The boat is quite straightforward to rig (IMHO). Very easy to de-power, mainly because it isn't really overpowered in the first place. You can go with just the main for really relaxing sailing. Does not tend to nose dive (in fact I need my weight quite far forward when sailing solo to keep the transoms from dragging). Mine has the center bar in the tramp, I like this because it gives me some support when the boat starts to heel, so I don't go sliding off the tramp.
The 5.2 is quite heavy for on the beach solo handling. On a nice sloping beach you may be able to get it back up high and dry solo, but can you still drag it yup the beach after a couple of hours sailing? I know I can't at our local beach, which has this huge sandbar you need to negotiate first. Luckily there's always help nearby. (Maybe I should get a Newfoundlander and rig the dog up with a harness...)
Righting solo is a hit and miss affair though. I really can't tell you if you can pull it off solo in light winds. My web research reveals that some can do it (heavier sailors like 200 lbs+) and some can't (those with a more average posture). You may want to consider this and carry a righting bag or install some other righting help. Or get your own Newfoundlander you can dangle off your shoulders....

Regards,
Dennis