This is my experience too. I resisted learning Objective-C very much, and tried to avoid learning it via MacRuby. But once I actually resigned myself to really learning Objective-C, I really enjoyed it.
Like Ruby/Python it has a specific style that gives you a different perspective than other languages. I now find myself using ObjC style-isms in other languages.
I think people find a language they like- maybe their first language, or one of the first couple- and then it is really hard to be interested in everything else. If you can't read it right off the bat, it "sucks".
This is how I felt about erlang. But the importance of concurrency was so high to me that I forced myself to learn the language, and now I love it.
A couple times learning a new language after being annoyed that it isn't like the language you already know, and I think people might recognize that every language has a reason for being....
Like Ruby/Python it has a specific style that gives you a different perspective than other languages. I now find myself using ObjC style-isms in other languages.