'What are your top 5 games this gen?' is a little too non-specific for my comfort, for instance, does this include handheld games and would you consider the current handheld generation to be 3DS and PS Vita, rather than the DS or PSP? I will try and answer the question though; this does seem to be an enjoyable one to take part in.
If I were to count the current generation of gaming as Wii, Xbox 360, PS3, PC (I don't think this one is affected by generations), 3DS, and Vita, well then I don't have to worry about handheld choices. I lack a Vita currently and while I have immensely enjoyed both Dead or Alive: Dimensions and Dr Lautrec and the Forgotten Knights on the 3DS I would not consider them for my top 5 of this generation. So then, I believe my top five favourite games of this generation are as follows;
5) Eternal Sonata (Xbox 360)
4) Asura's Wrath (PS3)
3) Muramasa The Demon Blade (Wii)
2) Super Smash Bros Brawl (Wii)
1) Kirby's Adventure Wii (Wii)
I do believe Eternal Sonata was also available for the PS3 and Asura's Wrath was available for the 360 as well but I have put down what console I bought the game for, not all of them which the games are available on.