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I do think that Luigi deserves more, stronger roles in games, but I'm not sure if I would call him 'underrated', because of his number of fans. It's not that you never hear people talking about him, it's just he doesn't get the in-game attention he deserves...
As for underrated games, two...
I think you should allow the starters to evolve, and to do it all the way, not just to the second stage. Sometimes pokemon can get certain moves only if they're evolved, and I personally think it shows an accomplishment and the pokemons' growth.
I'm Casey, a new member here. I'm pretty much your average Pokemon fan. Grass-types are my favorites, particularly Leafon, Chikorita, Cherubi and Budew. I hope I'll enjoy myself here at PokeCommunity!