What do you think of conlangs (that are not jokelangs) that don't use the IPA to define their phonology? I don't like them, because using such a system is inconsistent, and also, some people don't know to imitate accents!
It's a sign of being new to the craft. A common pitfall is saying something like "pronounced like the 'a' in man" when that could mean [a], [æ] or [ɛə]. But be nice, because we were all new once.