I havent actually owned any P-90-series pistols, myself, but have fired many of those owned by friends.
Those friends swear by them, owned them for years, and seemed to have had little to no real issues with them.
The ones I've tried out seemed very solid.
Try not to take too serious a lot of these "unreliable" claims from folks without their having some 1st-hand, substantiated experience or proof of it-regardless of make/brand, etc. And keep in mind that because one guy experiences a particular issue with one item or another, doesnt mean the entire brand/make/model is somehow flawed, or defective.
Also keep in mind that, like with anything else, 9 out of 10 issues are the result of Operator Headspace..
ever notice how many warning notices are stamped into the barrels, frames, etc. of most firearms?
How the 1st 2/3rds or so of every owner's manual is almost entirely warnings, and safety disclaimers?
Part of that is our over-litigated/ambulance-chasing mentality these days, but even that is based on something.
That something being that there are plenty of potential Darwin Awardees out there, who probably shouldnt be handling anything more dangerous to themselves (and others) than a feather pillow...