Seems like you are used to the current style of games which tend to be much easier then games "back in the day".
You seem to have missed the point. I used to beat such games without much of a problem when I was younger, that too with a keyboard. So I don't think I have 'gotten used' to easy games. I was even able to beat 2013's 'Rise of the Triad', which was a tough game made even tougher due to a myriad of bugs and glitches.
I didn't say you were used to easy games, I said you are used to the current style of games, which also (for the most part) tend to be easier. I haven't played the two games you mentioned, so I might just be talking shit, but my understanding is that these games (Rayman Origins at least) were done in the fashion of how platformers used to be. Hell man, I'm 30, I remember spending hours trying to hit that long jump just right or figure out a boss fight without the help of the internet. Maybe these just take a chapter out of the old school book.
Or maybe it is because you are getting old :p
Guess what? I managed to beat Sonic Generations! Turns out it wasn't that tough after all. A certain move required me to hold down the X button constantly, and simultaneously press the A button when required (on the XBox controller). Since this was only my second game using a controller, I thought that it would never be necessary to press two buttons with one finger of the same hand. Of course, no videos or text guides mention it in this much detail, so I was struggling.