Build quality was never that great, but I think the recent ones felt cheaper.

I have one that rattles slightly, but also have two that don't.

This is normal.

Mine kinda autoshoots sometimes :)

sometimes it scrols down browser pages automatically
And i have +button2 bound to mwheel, so sometimes it "crackle" in the middle of a fight, opponents thinks i'm bullying them

The sheer power of the mouse activates when you place it on the mousepad and it will start shaking randomly out of anticipation to rip people apart in whatever fps game you play.
You might wanna consider injecting some horse tranquilizers to the wmo otherwise people will accuse you of cheating.
The only person ever to tame a wmo was toxic. People always asked how he got buffed over the years because he was quite fat at the beginning, it was the effort put in to tame the wmo...

lol :)
I wish the WMO was this good