MK is impotent in large scale games. Hes only useful in tiny 1v1 with low amounts of towers, ie, normal games. In an actual tower-mass, he can't do ##@% for the entire game. Meanwhile flame strike is the #1 counter to siege units, and 12 griffs + penix focusing a hero prevents them from aoeing your towers. An MK on the other hand, does what? Stuns their lich for a few seconds while the DK just coils him back? Banish kills lich in a single volley
oh and flame strike is the only way you can stop mass tanks + cloud support. Actually, flame strike just plain counters tanks pretty hardcore.
Wow here I was giving you the benefit of doubt. Instead what do I find? You link me to a 4v4 replay of mass noobs/ that not only is from an outdated patch but a map of friends. Your theory doesn't hold at all. I wonder what happens when a lvl 10 bloodmage gets whacked by a lvl 3 bolt and focused by mass air, don't know but something inside me tells me that he will not cast flamestrike.
-A Karune Fan