I also mostly agree. I think 3D has a place both for adding depth to serious films and "fun" to films like Final Destination 3D and the aforementioned Piranha 3D.
Personally I have got myself a pretty nice home cinema setup so I'm quite selective about what I choose to fork out for at the cinema. I don't however have a 3D TV so it is one reason to see some films in the cinema.
What bothers me is the cynical pricing of tickets for 3D films. 3D should be a tool to entice people from their living rooms and into the cinema. Obviously there is some additional cost in producing and displaying 3D films but the size of the additional charge on already expensive cinema tickets strikes me as simply greedy and exactly the sort of heavy handed approach that drives people to piracy.