I've owned 2 P944's - one blued and one stainless. I still have and shoot the stainless KP944DC. Neither one of these guns are target grade, but both would shoot better than yours. I have shot some 10 shot groups at 15 yards from sandbags that were under 1 inch with the right ammo. (Some of mine were at least 2.5" with the wrong ammo, or I didn't do my part.) I think you were just unfortunate enough to get one that had a problem.
You'll find lots of people who flame Rugers of various models on just about any web forum. This also applies to Kimbers, Colts, Glocks, Smith & Wesson, Para, Taurus and etc. I've owned a shot a lot of P-Series Rugers and have an SR9 that has been thru the recall, a KP345DC with a couple of thousand rounds through it and the KP944 mentioned above. It has been thru about 1,500 rounds. All of them are strong, dependable and accurate guns. (I'm not just a Ruger fanatic - I have guns by Para, Springfield Armory, Taurus, Smith & Wesson.)
I would have called Ruger and explained the problem to them. They are good to work with and would probably have taken care of your issues. Ruger, as well as all manufacturers, are hesitant to immediately take you word for problems with accuracy. After all, they have no way of knowing about your shooting skills. Most will, however, test fire it on their range. If it meets their criteria for duty-type accuracy they will return it to you. If not, they will work on it until it does meet their criteria.
Don't be afraid to buy another Ruger, and don't be prejudiced by what you read in the forums. Go to a few gun shops and handle several different brands and types of guns. Going to a range that rents guns is even better. Buy what feels right to you. If you have problems, contact the manufacturer and give them a chance to work it out. Good luck and good shooting!