Metroid is not as bloody as GoW (both Gears and God), doesn't contain any profanity, Samus doesn't have sex or get naked, and it's not a first person shooter like CoD or Halo, so if you are a 14 year old kid that only thinks these things are cool and mature and whatever (like most 'gamers' nowaday), yeah, Metroid is "kiddy".
If you're a true gamer with common sense, no, Metroid is anything but kiddy.
Edited by Keviin, 08 March 2013 - 02:35 AM.