Yeah there aren't a massive variety of things to do, but pretty much everything is done either very well or amazingly. The learning curve is kind of... flexible. Basically whatever you like doing theres plenty of ways to test, improve and become more stylish at it. What starts as easy doesn't get that dull for me even though it's very repetitive because even after you've taken out Doc Ock and managed some of the ridiculous challenges there's still fun to be had finding cooler ways to take out a purse snatcher or finding new ways to move about the city.
I haven't even tried the Pizza Boy missions yet, I'm mainly just collecting points and trying the shorter challenges at the minute.