So I was playing RM4MI
And I have to say it was pretty impressive and made a great new experience out of RM4 (which was cool and all but not quite able to hold its own cf RM2 and 3 imo)
Fave RM stage is definitely Pharaoh, left finger pointed up and Pharaoh Shotgun shots flying everywhere. To be fair the random effects in the stage were a bit TOO frequent but they were placed well to troll the hell out of me. XD The whole boss sequence was epic though.
Most original weapon was definitely Recycle Inhaler for me, but the funniest was (White Magic)Toad. Most useful... tie b/w Dive's 'this is a water (not-)laser' and Spark Chaser.
Cossack stages... so-so, didn't like Cossack 3 in particular. At least its boss made up for it somewhat. Cossack 4 though was damn fun, and meeting up wi' ol' Terra was a blast (and his weapon too XD)
Wily on the other hand... they were pretty fun, and Wily 3 in particular was epic. Not just for the 784HP machine XD
Didn't like the post Wily 4 pre escape sequence bit that much (except for the boss). And the escape sequence is EXTREMELY punishing.