Wow, what a 180 turn! You said they were useless, and now, after they started to require monthly pay, you're advertising them Shocking!
Actually, if you look closely at my prior statements, my opinion on them never changed.
If you consciously _rush_ Mercenary Commandos, and get them early, yeah, they're great.
If you miss their window of utility (i.e. the point I was at when they were available to me) they're pretty much crap, which is even stated in the quote you just cited.
My view is and has always been that they should be in some way upgradable or scalable so that they have a role beyond the early game, and that giving them an upkeep further diminishes their already questionable value beyond the early game.