Drawesome

Plus:
Doesn't throw you in random lobbies, you can choose yourself.
The keybindings are useful. There is a transparency slider for colors and the chat can be hidden.
Minus:
Moderation is a bit of an issue since you can't see who is drawing what.
edit:
As commentator below pointed out, all features are available without premium.

I'll start with the cons first

Cons are most people there are very toxic
and sometimes would erase or bump spam doodles over your artwork!
There literally no moderation,/ very poorly managed and not many people either
Most rooms are dead while only few are barely active.
Posting images on chat is a real pain
since it does not support sharing images directly
and only copy paste images from Imgur to the-chat is the only way.

Pros

very easy but sometimes confusing interface
but its quite easy to get the hang of it!
You can change avatars without approval
and its quick as a breeze!
You can even add friends and send private messages to-them!