What is the greatest Ubisoft Game ever made..?

Happy holidays! I'm so used to seeing Ubisoft shoot itself in the face that I almost forget they once had this rather compelling run of great games! Ghost recon, rainbow six, Splinter Cell, Rayman, AC, Far Cry... I mean, there was a time when they were rocking, before every game coalesced into this samezy, bloated, brainless approach we've all come to loathe.

If you can draw yourself through the history of Ubisoft does one game stand out as their finest work?

I think for me I was most completely hooked on Splinter Cell games the Ezio trilogy and far Cry 3.... Many others I had a great time with but I'd say for me it's between far Cry 3 and AC Brotherhood.