I'm not so sure about Nintendo "deserving" the top spot. The fact is, Nintendo made the right product at the right time and now they are on cruise control to win this generation. Nintendo has earned their top spot.
The one major flaw I have with the Wii was the lack of a dvd player. Not that I needed one as I own all 3 consoles this gen but it somewhat surprised me as I would have thought that they would have included one. A lot of friends/co workers were slightly disappointed by the lack of one. Im not a huge fan of the big games on Wii as a lot of them are just more of the same (Zelda, SSBB) but thats just my opinion and it's to be taken with a grain of salt :) What I love about the Wii is playing the old, old games like Super Mario Bros 3 etc etc. Thats what sold the system to me.
All in all though I firmly believe gaming is headed toward the HD direction. While both the PS3 and 360 have made mistakes (RROD 600$ price tag o.O) on trying to gain a larger foothold in the market, both MS and Sony showed us, the consumers, what next-gen hardware is all about. Until the HD format becomes more and more universal the Wii will continue to outsell its competitors and produce quality software. Oddly enough the next round of consoles to be released has me a bit fearful for Nintendo. HD will be fairly common to say the least and it will be interesting to see what direction the Nintendo will take. Until then gratz to the Wii and Nintendo :)
Consoles Owned: Sega Genesis, NES, PS2 (RIP) N64, Xbox, Xbox 360, PS3, Wii
"In individuals, insanity is rare; but in groups, parties, nations, and epochs it is rule."
~ Friedrich Nietzsche