I worked for EF English First, which is Moscow, based, for over 3 years. They have their faults, but I know quite a lot of people who have worked for them for many years (and are not loser types), and still remain enthusiastic about teaching, so the company can't be all bad. I think my friends' enthusiasm reflects positively on them rather than the company, I'd like to nominate EF English First Moscow as the best possible school to work for. Of course you might read various negative threads about the school, however, if you pay attention these are all submitted by the same person, most probably a competitor company or something. Just ask for evidence from the blogger via e-mail check if what it's written can be proved, otherwise you know.