This.
I can't understand what kind of blatant ignorance is going on in this thread.
The demo for Rayman was not the best indicator of the heights the title can reach, even so, the first three introductory levels of the demo allow for more playability, graft and challenge than all of Portal 2 combined.
Some of the levels of Rayman Origins smoke Portal its not even close.
Both games have Co-op, but only one of those games will you keep going back to the levels and aiming for perfection. Only one of those games will constantly blow your mind on the creativity and level design.
Portal 2 is not a bad game, but when compared to Rayman only a fool would tell someone to waste their money and very ( short ) time on Portal 2.