Actually, that's a myth. Trek has always told more morality plays--issues of right and wrong--with social commentary a bi-product of that (albeit a frequently hyped one). Character development tends to vary from Trek series to Trek series though. Action-adventure, however, is prevalent in every Trek series. That last part isn't really true. But all Trek stories start with a McGuffin, something that forms the basis for a story and things develop from there. I honesty have no idea what Trek you watch to say that action isn't a part of Trek. From Captain Pike's tussle with a Kalar in "The Cage" to Spock's showdown with Khan in Star Trek XII (with plenty of space battles in between), Trek has had action as one of its mainstays. To claim otherwise is simply overlooking or ignoring it. Trek has always been a mixture of drama and explosions. That was mainly with TNG, with other Trek shows (particularly TOS and DS9) generally having more action content. Trek movies, however, tend to be even more action-oriented (and rightfully so, IMO).