What games can you recommend that didn't get the appreciation that they deserved?
I've been recently been thinking about Arkane Studio's Prey which is a immersive sim, with a pretty good rogue like dlc, that probably has one of the strongest hooks of any game I've played. If you liked Halflife, System Shock, or Deus Ex it's definitely worth a play.
Are there any titles that might not have been commercially successful that you feel everyone should give a shot?
As the first of these is a platformer, the second is a topdown shooter, and the third one is a match 3, so commercial success was not that expected anyways, but I really think they excel at what they were set out to do.
I feel like Dustforce got decent buzz when it came out. I imagine it was helped by its phenomenal soundtrack. The game was too hard for me to really enjoy. But that soundtrack, I still listen to it occasionally.
The same artist did the soundtrack to Tunic, and while not as good to listen to outside the game, it adds so much to the ambiance of the game and elevates it.