You guys can't see it, can you? Titanfall was designed from the get go to be that kind of game, taking the best of BF/CoD and mashing it with sci-fi/Mechs. This was tried before on PC in Shogo, years ago (a combo of FPS and mech combat).
I think exclusivity was sought by MS, because Halo has kind of burnt itself out and something new was needed to help push Xbox One. Yes, its on PC too, but Japan has never embraced PC gaming (while I'm sure we'd all love to see that change, as they are missing out on so much games), that leaves Titanfall as an Xbox One lead game, many gamers in Japan will crave. Doesn't matter if some don't like the facts of it, but it is exclusive to Xbox until the sequel comes out (ages away). If you have a PS4 and want a dose, just buy the PC version, if buying an Xbox One is too much for you.
When Xbox One is released in Japan in 2014, with Titanfall alongside it sales will be high. in fact I wouldn't be surprised if there was a Xbox One shortage because of it. I just hope MS get their act together to benefit from it.
As for japanese gamers liking Titanfall, I'm not surprised by this news (four hour line...wow). Gundam and other mech games from japan, have yet to make a convincing enough world for their mechs to inhabit (possibly due to their lack of capable 3D artists etc. They focus too much on the mechs looking good and not enough on the characters, environments, effects etc etc, making these games look sparse and cheap. An arcade fighting game might look good for the arcade, but its a quick fix by design. I believe that japanese mecha fan want something deeper, but have never really got it.
Pacific Rim showed what could be done with film through good 3d and special effects, which also went down well in Japan, so I expect Titanfall to do huge sales there too. Make sure you keep watching March 2014, to see how MS play this one out.
As for RE4/5/6, you'll notice those are Capcom games. Capcom are devs that have adjusted well with changes in 3D dev software over the years, when many smaller japanese devs might have done the opposite, hence Capcom getting TPS/FPS games done so well, while other japanese studios struggle.