What's the hate against them? In my opinion if you're invading and forcing your way into a world you're gonna get ganked by a lot by coopers. Do you really expect to find a ton of solo players who don't know how to pvp? Put your sign down and if you still get ganked well bad on them.
I'm a frequent invader and deal with gankers all the time. I have no problem with them.
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I got ganked off a summon yesterday. Most annoying thing I've ever encountered. They even let me fight it out with a guy 1v1, then mid fight backstabbed me. Then 'teabagged' me per say. The shittiest experience I've had thus far.