If you go into it knowing that they are not precision weapons and that they are quite uncomfortable to hold, they are a lot of fun. People who bitch and moan about them, expect them to be something they are not.
They are fun and pretty cheap relatively. If you are looking to do precision work at 25-50 yards (which I am assuming you are not) then don't get these guns.
You can certainly hit something at 10 yards, actually you can hit it without aiming (which is the only real way to shoot these things). If someone misses their target at 10 yards with a PM-11, they can't shoot.
Accept it for what it is and you'll have a great time shooting it.
They are the cheapest class IIIs, they are one of the cheapest in post-ban, hi-cap mags are cheap. They are just a lot of fun, buy one and enjoy.