Should I buy GMod

i think you should buy it, Gmod is such a flexible sandbox game you can have almost any sort of gamemode you want.

110% better with friends. a lot of the people are cancerous on it, but when you got the right buddies playing with you its like heaven man

Is better with friends, but join a decent server with nice team spirit and you will be able to have just as much fun :D

Get it. You can play different game modes and maps. Some include prop hunt (hide and seek as props), DarkRP (light roleplay) and Jailbreak (Players try to escape the jail). I should add that a lot of the game modes require Half Life 2, Ep1 and 2 installed because they have common used props. Also counter strike source is a top one.

Everyone should have Gmod on there PC. its the ultimate sandbox game. Oh the memories me and my buddies have on gmod back in the day with all the mods and the nukes and the face adjustment and ragdolls lol. im getting hard just thinking about it.

Yes buy it,This game is the best sandbox you could find because there is a workshop with 1250000 Objects on which you can download and create server for ourself or for random player AND
you can do roleplay like is it no possible on every game.

Big YES, a lot of gamemodes for a cheap price. It is very recommended to play with friends

You should buy it, it's fun to play with friends or alone. There is a lot of gamemodes and all gamemodesisfun to play.

It depends. if you are the type of person to enjoy lots of crazy gamemodes and servers (a la Minecraft) then i would say yes. If you aren't into that type of hectic multiplayer experience I would say no.... but it's so cheap now you might as well get it!

I would recommend gmod its fun with friends and such , just stay away from DarkRP servers until you are willing to witness the bottom pit of the barrel.