Yes, it's not AS good without DX11, but whose to say it's not going to be fun without ultra-HD inyourface graphics? Not me - either way, If you tryed it, and not liked it just because of the graphics, have another go - if you didn't like it the second time with the gameplay, return it.
Also, Crysis 2 is STILL the most graphically intensive game, you have nothing to lose.