I haven't played the games yet (haven't returned to Windows Phone 8 yet because of the TellMe bugs), but I too am worried about Modern Combat and N.O.V.A. If they can get Asphalt to work fine, I'm sure they can get the shooters to work. Idk how smooth they've worked it out on Android with the same SOC, because the last time I tried it on an S4 SOC was the Galaxy S III and both games ran like crap (Modern Combat 3 and N.O.V.A. 3).
Shocked to hear Spiderman is so bad, but Asphalt is smooth, seeing as Spiderman is a graphically less-intense game (or so you would think).....