I've read elsewhere that people didn't like what appeared to be minor changes in terminology, as you suggest. Phase pistols instead of phasers. Photonic torpedoes instead of photon torpedoes. Etc., etc. The Klingons in the very first episode bothered me. Then the Ferengi showed up, but since we never learned the name of the species, that's okay because it doesn't violate continuity. I think that's what turned a lot people off about the show.
There was also a mention of Ferengi in the Dear Doctor episode, a patient describes them as a warp capable alien race.