Ruger's are solid...
I've had a P-90 .45 for almost 15 years now. Bought it used for cheep. Then found out why it was cheep. The mag release was broke and would not hold the mag in when fired. Called Ruger, they sent me a new one, no charge.
Not long after, it dropped out of a shoulder holster (didn't have the strap tight enough) and bent the front site. Called Ruger, one came in the mail...no charge.
About 10 years ago, I was trying to break it down, and I would press the ejector down, but when the slide went forward, it would release so the slide would not come off. Called Ruger Technical Support, came to the conclusion the gun was old and the part that kept the ejector was worn and letting it release. The gentleman on the phone told me how to fix it in place and they sent me a new one for free. Since I didn't feel like filing the part in question down, I just waited for the new one.
About 6 years ago, I had this gun in a bag on the seat and got in a wreck, when I tried to take it apart, no dice. Sent it in to Ruger and they fixed whatever was wrong with it....no charge.
The only problem I have ever had with loading was when trying to cycle some reloads I had made. The bullets were not round nose so there were some feed problems. Pushed the bullets down a bit farther into the case and they seemed to cycle fine. Haven't had a chance to go fire them and see how they work under normal fire conditions.
Other than that, never had any issues with it. I work with a guy that has a ruger 9mm and my FIN has one as well. Both like them.