Coming from Python, any extra verbosity really drives me crazy. Declaring variables, and having to write the same thing in the header and implementation files hurts me. I could probably live with that though, I guess it's the memory management for iPhone development that really bothers me.
I think I'm just a high level programmer and I get bored/discouraged really fast if it takes too much work to make something happen on the screen/phone.
(Obviously C# really isn't that much better, but I was thinking .net on iPhone might lead to ironPython?)