I thing I'd like to see become more common when people recommend media, especially long-running stuff: saying how far in you have to get before you'll know whether you like it or not. Alternately, where to start if the beginning sucks.
e.g. "Hey so I like thing for <reasons>. If you give it a shot start from the beginning but please give it until episode 8 or so before deciding whether it's your thing; it starts off a bit rough."