More than the linguistics problems, there should be other cultural difficulties -- like hand gestures for instance. A simple movement of the hand -- to beckon someone for instance or to indicate "OK" -- can be considered obscene even by other cultures here on our own planet. How likely is it then that the team would run into problems simply by waving "howdy" or pointing at an object, etc.?
There was a recent ep of "Enterprise" where alien guests stormed off terribly offended and couldn't bring themselves even to discuss the insult with Archer's baffled crew. Turns out these aliens do not put food in their mouths in front of others. Eating is a private act.
The team could, without getting into language and subtitles, still have some amusing, confusing moments sorting out different cultural norms on alien worlds.