Your playfield cannot be warped until you get a small accurate level and obtain different readings from different parts of the play field. Even then it might not be warped, but could be something else going on.

Where I live, .8 degrees is pretty normal when it comes to slab on grade floors like basements.

Horrible person, no. Do you games play like shit, yes.

This app is awesome. However, there is a horrible bug in iOS (iPhones) that provides inaccurate level readings. It is 1 degree off. Last night I leveled 8 games, I still used the pinguy app but my game was level left and right when the app said, and was level front to back when the game was 1 degree too low according to the app.

Amazon has a really great digital level for $25, use both to level your game.