Aight let's get something straight:
Capcom did NOT invent EX moves!!! That credit goes to Waku Waku 7, so in essence you can say SNK was responsible for that... This is yet another feature that Capcom took and claimed for themselves, as they did with Parrying...
I also remember SNK games having super powered versions of normal supers, like P-Supers in FF/MoTW, and even ones in Samsho, and other SNK games... SF4 wasn't the start of these crazy supers... They just took advantage of the "commercial FG hiatus" and threw things in people's faces that they've seen before and made it look brand new... No there really wasn't a FG drought either, and I have at least 4 reasons to prove that, but that's for another discussion...
As far as MK is concerned, MK2 was solid, just casually promoted, and its American, so it was under a shadow per sé when compared to SF2... UMK3 was probably the 2nd best solid game (I think it's better than MK2 though, even though combos were harder to do in MK2)... Again, being under a shadow, and in a period in time where the internet wasn't so dominant in people's houses (remember those Aol trial CDs, Encharta, and actual BBS sites??), so you didn't know who was playing it, where they were playing it, and on what system unless you went to school with those cats... I mean, MK is solid now imo, but is still getting dogged by America...
I honestly don't see how X-ray moves are similar to Revenge Moves... I mean it's not as over the top as they were, and real talk, MK had something like that already in Deadly Alliance, where you would hit a button to impale someone, and they'd bleed til the end of the round... They just revamped that imo, and made it so that the game was still competitive without wondering if there were gonna be any shenanigans like that, or the UMK3 Kabal rushdown...
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Ok, back to DOA... The last one they released for the 3DS had such an in-depth story, which filled lots of holes that were made in the previous games... Kudos to them on that...
Honestly though, I feel like DOA is better off without Itagaki, as if he was holding the game back from being better... At the same time, Team Ninja is making good moves in terms of story and appearance, but when it comes to the actual gameplay, it's meh... I mean when the community is telling them of changes that need to be made, and they interview the bigwigs, all they've got to say is "We feel the game doesn't need to be changed. Blah blah blah", WTF is up with that?!?!?! They're so inspired by Sega they basically take the same business/marketing approach and avoid engaging the customers/fans... I don't understand it... The community has been crying for an overhaul of DOA and to make it more along the lines of 3.1, and these guys are like, "yeah man, whatever..." They don't realize that their game is at the bottom of the totem pole of fighters, and I like the game, but it is what it is... Smash does better than DOA, and DOA is only doing ok because of mad advertising/promo from Microsoft, and it was a launch title, like part 3 was...
Anyway, I hope that they actually do make vital system changes in the game... Aside from removing falling KO's, and adding stupid moving danger zones, I definitely am not a fan of forced wakeup by being down attacked... That eliminates the whole wakeup game, and it's a lazy way out of guessing... Plus it keeps the downed opponent from moving anywhere, they just get up right there, only to be left open for a grab, or whatever...
I do like how the characters don't have an anime look to them, but they actually look real... I feel sorry for the Spartan players though... I hope they add new characters though...