If your someone who thinks mugen is a legit fighting game, then your a fucking retard. Period. And Footies is where your opponent is at a range in which you attempt counter attack their pokes, or bait their attacks and poke them during recovery.
The only thing button mashers have to there advantage is that they are unpredictable, but in a way that usually hurts the person doing the mashing. Since predicting becomes pointless (since any attack my arbitrarily come out at any time for any reason) the best counter is either spamming high priority attacks (uppercuts, supers, etc), spam throws (since they are mashing, they wont tech or reversal your throws) or just zone and they will kill themselves off the spam.
The best example of this are the trap teams in MVC2 (Clockw0rk, Duc, Blackheart teams, etc...) They are basically a team that is designed around making an overwhelming amount of projectiles that force the to block in order to chip,to control the space on the screen, build super meter, and mix-up while they are locked down. Because the team is designed around doing a lot of chipping, if your opponent just blocks and waits for you to stop, you'll win since you dont need to stop. You can just keep doing the attack pattern till they are chipped to death.
Once you know the basics of a trap team, and you will just outright curbstomp a button masher since they dont know what is happening, they will not know how to correctly defend against it, and if they start hitting buttons (which is what they will do anyway), they will kill themselves trying by being hit by the overwhelming amount of projectiles. And if they react by blocking until the opponent stops, they will get chipped to death. A real player can get around the trap by looking for the right openings, counter calling assists, push blocking, and other things that a new player would have not even thought about.
Arguing that someone ignorant of how to play will beat someone who has proven to be one of the best in the world just by sheer luck simply based off of your ignorance the genre, and a real player will take a masher to school every fucking time.
To be fair, most people who "know what they are doing" are just mashing with moves that require execution to pull off. There is still no rhyme or reason for them doing the moves that they do, they have no plan aside from doing specials, they are basically a glorified masher that can do specials and maybe do shitty combos.
The point is that your arguement is that Jwong isn't good cause you beat a random shithead in Mugen while mashing, doesn't make any fucking sense what-so-ever. But i do have to admit, with all my hating mashers and basics on why mashing doesn't work; watching someone getting scrubbed out by a masher is very funny to me. But in a sad way. Its like watching your friend getting kicked in the nuts. Its Hilarious to watch, but you feel sad that he had to endure that pain.
Anyway, if your still reading here is a link that can show you what I mean when I talk about the depth of fighting games.
http://www.youtube.com/watch?v=tMyv1OwLVvA
Its a REALLY deep look at how blackheart works in MVC2 and about the execution, mechanics, and mind games of the character.