Well I always thought Xenoblade Chronicles and the Last Story were overlooked by many purely because it was on the Wii which is a shame as they were easily two of the best games from last gen and gave a massive kick up the arse for RPG type games. Mario Galaxy was also amazing but I dont think that was underated or overlooked I feel there was less underated and overlooked games on the GC because Nintendo had not made an effort to distance themselves from core gamers there. Little Kings Story was also overlooked by many it was a great game but I have no idea why they never used the Wii remotes functions as in that game it would have made perfect sense.