"Everything should be made as simple as possible, but not simpler." - Albert Einstein.
This is hands down the best RPG I've ever seen/played, especially as a DM/GM. Everything is simple and streamlined without being dumbed down. There are no barriers to enjoy the game, there is no friction from the rules during adventure writing and during play. It just makes sense and flows beautifully every single time. It leaves out anything complicated and cumbersome. It is just fast and fun all the time.
For a DM it is a godsend. You can keep everything in your head and you can easily adjucate whatever comes up and can improvise with ease on the spot. You can create new loot, new spells and new monsters in a matter of minutes without having to consult cumbersome rules and as a bonus whatever you can come up with you can use with confidence without the fear of creating obvious imbalances. As for players even complete newcomers to RPGs can learn the rules in 10 minutes and start enjoying it. Players can try anthing, there is nothing stopping anyone from coming up with brilliant ideas and solutions. Character advancement is smooth and the game is equally fast and fun at lower and higher tiers.
You can play any genre with the system - fantasy, sci-fi, horror; you name it. Due to the system's simplicity and brilliant design anything from any genre is 100% compatible with anything else. You can have a wild west character in a sci-fi setting if you wish.
As a bonus, the system is very hackable. You can easily add whatever new mechanics you think you need or modify existing ones.
I can't recommend ICRPG enough. Get it NOW!