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Plenty of games have less than 10h of gameplay, and an even bigger amount of games have less than 10h of non grind gameplay. Portal is a good example

That's only if you didn't tell the players your game has 10 hours of gameplay, and made them expect it to have much more. I.e. you engaged in dishonest marketing.

If you present the game honestly, then people can evaluate the price you're asking for vs. what's being offered, and they have no reason to complain that it was too short.

It depends on the game and on how it's advertised. And I personally prefer 10 fun hours than 25 padded to hell and back. Other than Portal, there's also the latest Wolfenstein game, which had less than 10 hours of gameplay.