The initial point is the huge number of bad reviews on the App Store....So it is the majority !
Unfortunately even App Store reviewers aren't a randomly-selected sample, it is human nature to seek out a place to register a poor experience, but not to register a good one. Must admit I had to do a restore last night as trying to get my mobile data stick working under EC was such a challenge it ended up unbootable, got it working this morning on the restored EC system so a bit odd and time consuming. But under Yosemite I had zero issues throughout...doesn't make EC junk though IMHO.