What are the differences between CS 1.6 and CS:GO? A simple bullet point comparison similar to What are the differences between CS 1.6 and CS:S? would be nice.
First of all, there are many differences attributed between CS1.6 and CS:GO. The most important thing to note is the engine; it's improved dramatically over the past 9 years (CS1.6 was released in 2003, CS:GO in 2012). Namely, CS1.6 uses the GoldSrc engine, which is a heavily modified Quake engine, and CS:Go uses the Source engine.
I will add more.