No language has zero warts. I use it everyday, and love the language, and it's still sometimes painful to do good OO compared to Smalltalk. No meta classes sucks, static methods are a poor substitute, can't override them, can't call them on passed type references without reflection which is ugly. Multiple equivalent syntaxes for anonymous delegates is a wart, they should have just started with the shorter one. Foreach over a container lets you declare the wrong type and throws a runtime cast exception when it could often know at compile time that it's not valid.

Still, great language, love it.