Should i play this?

It really depends what you want to do in the game,
Garry's mod is a sandbox game but it can be developed and turned into much more, for example
sandbox is where you can play with other people and servers or by yourself and mess around building what ever you want, it could be something serious like an un-raid ablebase or something for example a flying cock.

But then there are more serious roleplay's where you have to follow orders , i generally would recomened to test them all to check them out and see what you prefer.