PDs aren't using Rugers not because they aren't reliable but because the Glocks have been in their armory for over a decade as opposed to the Ruger which hasn't even been on the market for 2 years. With budgets tight like they are, PDs aren't in the position to be shopping for new firearms for their officers, not to mention armorers training, parts, tools etc...
My SR9 is reliable as all get out with Gold Dot, Hydra-Shok, Golden Saber and XTP factory loads. The only time I've had any issues was with some really light reloads that didn't have enough power to cycle the action. Compare that to my friend's Glock which has been back to the factory twice for FTE issues with factory fodder. Main problem I have with carrying it is the lack of holsters available in left hand. Apparently because I'm a lefty I'm only meant to carry a Glock, SiG, 1911 or J-frame.
GB- the SR9 is a totally different animal than the P90. I had to shoot it one handed with strong and weak hand as part of my Nevada CFP qual and it was a piece of cake. The grip frame is much slimmer than the Glock and actually has some contour to it (my biggest gripe about Glocks), fits the hand well and points naturally. I understand your opinion and understand that it is based on past experience with Rugers, but things do change.