IntelliJ IDEA 2016.3: Ugly Font and Button Rendering on Ubuntu 16.10 when using Oradle JDK 8.112
Answered
IntelliJ IDEA 2016.3 without bundled JDK renders buttons and font the "ugly" way.
➜ ~ lsb_release -rdc
Description: Ubuntu 16.10
Release: 16.10
Codename: yakkety
➜ ~ java -version
java version "1.8.0_112"
Java(TM) SE Runtime Environment (build 1.8.0_112-b15)
Java HotSpot(TM) 64-Bit Server VM (build 25.112-b15, mixed mode)
➜ ~
Using Oracle JDK:

Using bundled OpenJDK

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This is expected, see http://youtrack.jetbrains.com/issue/IDEA-57233.
Bundled OpenJDK fixes a lot of font rendering issues that will be fixed only in Java 9.