[b]Under-Rated:[/b] 
Salt and Sanctuary. Now if you can guess I'm a Soulsborne fan (Demon's Souls, Dark Souls, Bloodborne), so a 2D game that is similar to those, hell I'll play it. The game really didn't seem to get a whole lot of advertisement, I think there is only two trailers made by the developer, Ska Studios, but it was a really good game that like Souls has some rather interesting lore tied to it with each boss fighting feeling unique and different from the next.The interconnect level design with how different zones match up was flawless and overall had a covenant system that I think Fromsoft should really take some lessons from. To top it off it was made by two people, just two people and it was brilliant. An indie title that IMO could rival some triple AAA titles.

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[b]Over-Rated:[/b] 
Skyrim. I had never played an Elder Scroll game before so this was my jumping point into the series but ignoring that, this was the game that in highschool I remember people talking about and hyping about. So eventually I caved and got it to see what was the deal. For maybe the first half hour it was good but it then fell like a rocket. People hyped this idea of fighting dragons that I found to be annoying, I don't know how you ruin a good dragon fight but Skyrim did that for me, making them feel like misquitoes you swat away on a hot summer day. The story also was just so dull and boring that I had no desire to beat it. 
At least there is modding for it on PC, modding is the only thing that made the game somewhat fun to play, to see these things other players made that I would argue rival what Bethesda gave us.

Overall for me Skying did not deserve the 9/10s it got and at most I would give it a 6/10.