I don't mind the map re-use. We can't realistically expect them to create all new maps all the time for these things. That would be far too much development expense. If they did that they'd have to charge for them as DLC like MW3's "let's release one specops mission with each multiplayer map pack". Screw that.
400,000gs reached 1-13-15. Used D4 to get it (get it, it has 4 in the name) due to my disgust with how Halo: MCC has been handled. Achievement used for 400k milestone: Business as Usual.