Minion rules are crap, IMO. They're an interesting idea, but I do not like the mechanical execution of the idea.
By the way, have you tried them or seen them in play?
Because in my limited 4E experience (we're still on 3rd level), they are surprisingly dangerous. If you're reading the rules, they *look* like being cannon fodder.
But in play, you simply don't ignore them. They are actually pretty hard to hit (on par with other monsters) and
feel like a threat. Since they aren't that easy to hit, you usually need to attack a minion at least twice to hit it for good.
Since you're easily attacking them several times, they feel like real monsters, not like one-hit scenery, at least in my experience. Heck, in the last encounter, the minions went down last, because we had such a crappy luck with our attack rolls against them - and their damage isn't piddly, especially if two of them are flanking you, hitting you reliably.
Unless your DM really calls them "mooks" or "minions", it's hard to tell the difference, at least threat assessment-wise.
It's again one of these 4E things: Looks bad, plays good. This starts to startle me more every time I encounter this.
Cheers, LT.