I think you vastly underestimate how complex this game is from a purely tech standpoint. Its atrocious showing on old gen is expected and dare I say normal.
If the game is identical design wise then it can only lead me to conclude the 360 holds it back. I maintain, you have to be more ambitous on a modern platform. If they have taken their design to a new level the 360 should miss design goals, we will see if this is the case.
There are many games which would not run on 360/PS3, take Mad Max for example, or Dying Light. Last-gen versions canned not to compromise the modern skus, I fear this TR may have to compromise heavily in order for a 360 version to exist. That is unless they refuse to let such an old console hamstring them.
As a sidenote I never implied I didn't like the game, why are you resorting to such pitiful strawman ? I'm very much enjoying what I see, but I can't help but feel disappointed by the mere existence of a 360 version.
Graphics are not even my primary concern, because I assume the PC version will look better at higher settings. The game design itself however will remain identical, and possibly because of a console released in 2005.
I'll let that sink in.