From the look of the game - at least from what I was able to glean from newLEGACYinc's release stream - it's decent enough. I don't have 2k14 anymore, and I'm only planning on getting 2k15 on 360 to hold me over 'til the PS4 version releases, so I don't really care all that much.
What was interesting though is a crackpot theory someone came up with that almost sounds kind of plausible: the old-gen version of 2k15 was intentionally kneecapped as a means to dissuade consumers from buying it (and thus allowing them to cut support earlier, as opposed to THQ keeping the franchise supported on the PS2 up through SvR 2011). Literally everything that's been announced that had some sort of fanfare or interesting reaction has been for the current-gen versions of the game with the exception of Who Got NXT, which is basically another take on the Attitude Era/30 Years of Mania/Showcase gameplay anyway.
Like I said, it sounds absolutely batshit, and it'd basically be 2K, WWE, and Yukes basically throwing away money and potentially customers... but it kinda makes sense. Or at least, I want it to make sense so I don't start thinking that the current-gen version is equally as gimped.