from what i remember there were at least three "problems"which really weren't problems at all.
1)the gun was polymer.at the time glocks were new to the u.s. and a "plastic gun"was just a toy.remember the rumor that plastic guns wouldn't show up on an airport metal detector?i seem to remember that glock added metal somewhere in the in gun to appease this.
2)i seem to remember that the early guns jammed easily.i believe that it had to do with powder residue building up on the slide rails.
3)i know that the roller trigger felt(feels)odd when you are used to one that pivots.
4)it sure didn't"look like a gun"the design was markedly different.
that said,my best friend has used his for the last 10 years to control the feral cat/racoon population around his farm.he loves it!
my opinion,even if my memory is false about what the "problems"were,is that the gun was just a little ahead of its time.(we are still not ready for the GYROJET!)
i've read that mr.stoner designed some very good weapons.i think that,given the chance,this one would have been too.