Today I installed pylint on OSX (Python 2.7 Homebrew , pip 7.1.2). The pylint executable was nowhere to be found. In ended up copying the file from Github, pasting to /usr/local/bin, and making it executable, which seems to solve the issue.
I am fairly new to OSX, why would pip not install the executable?
It's much probably a bug. You should open an issue on pylint's tracker at https://github.com/PyCQA/pylint/issues.