Things I have noticed off of decent matches I have had lately:
Vs Solomon Grundy: if he is sitting full screen.. You know his grave hands are coming.. D,F1 beats him to the punch. Grundy likes to dash or jump to close ground.. Read which type you are playing and punish from there. You have WAY more range tools in this MU, no real need to get close. Do not let Grundy lull you in to getting close to sweep distance.. That is where he wants to be. Air guns and straight guns keep him at bay. If he starts ducking this shots.. MB cupcakes.
Vs Green Lantern: another character you need to pick your spots with.. Mid range belongs to GL, so you want to be full screen or up in his face. Up in his face, get comfortable with your D1, and do not be afraid to throw. To get close to GL, let him come to you.. Since jumping in on him gets you wrecked. To do this.. Annoy him with pistol shots, Pop Pop, and cupcakes.. Do not be afraid to MB if one is working better than others. You CAN duck his rocket projectile, block his air rocket with back (or jump). Again.. The more frustrated he is the more he may try to get in sloppy, look for mistimed jumps, or his turbine/air turbine move and punish with B3, MB B3 respectively. Jumping into or being caught by Lanterns might is the key tonGL starting his higher damage.
Sinestro/Deathstroke- PATIENCE, PATIENCE, PATIENCE. These two MU's come to a screeching halt.. DS is trying to bait you into his sword flip, Sinestro trying to bait you into his axes. Watch for them, wait for them, and do NOT rush. Keep an eye on their meter.. if they have meter you know it is getting used..Take your time at getting in and once you are in.. Do what you can to stay there. The majority of zoning heavy Sinestro/DS are blocking high ( trying to back up and give themselves room), hit low if close and punish accordingly.
Hawkgirl and Black Adam are still my two hardest MU's.. Hawkgirl is getting a bit better the more experience I get against her, MB cupcakes really do hurt her... Still need advice on these two however.