According to ESRB, this game contains: Animated Blood, Violence
Parents probably won't have much problem with Corruption. There is plenty of violence, but it is only against odd space creatures, and, while intense, it's never notably gory.
Fans of the Metroid Prime series should definitely play this game. It really culminates the series with its excellently-tuned use of Wii controls, and in ending manages to show that Samus is a real person behind the mask.
Casual Wii gamers may find this too intense for their liking. I think the game is playable to "newbies" to the Metroid series, but to finish the game requires more commitment and skill than nightly rounds of Wii Sports or Cooking Mama. Don't get me wrong, I love Cooking Mama, but it's an entirely different challenge than an atmospheric science-fiction themed exploration game with lots of shooting.
Fans of first-person shooters aren't going to leave Halo 3 or Gears of War for Corruption. However, they might enjoy at least seeing how the Wii controls allow for a smooth first-person-based console experience.
Deaf and Hard of Hearing gamers will do just fine. A lot of the backstory is achieved through reading scanned data; and all spoken dialog is accompanied by subtitles, so nothing verbal will be lost. There are instances where an enemy may be heard before it is seen, giving warning of its arrival, but I don't think this would negatively impact the gameplay. Samus has a radar which shows the locations of enemies, which is more useful for pinpointing their locations.