SturmRuger got started with the MkI .22LR pistol which evolved into one of the most successful pistols ever. However, in general, I think it fair to say that Bill Ruger's emphasis was on the consumer sporting market. The M77 bolt action, the Ruger No. 1 single shot, the Blackhawk and Redhawk large revolvers, even the Red Label O/U shotgun proved successful in the marketplace.
It is just my opinion, and observation, that Ruger's attempts to compete in the "service pistol" market have been lackluster. The Service Six series of revolvers were primarily intended to for law enforcement. Although the design was both innovative and solid, going head to head with the firmly entrenched S&W models 10, 19, 27, etc. and the various Colt offerings was a lofty, if not impractical, objective. The Service Six did manage to capture a only a very small share of the market. I am personally a fan of the vintage "Sixes".
Similarly, by the time Ruger brought out their P series semi-autos, LE agencies were full shift away from wheelguns to primarily semi-auto DA/SA pistols. Again, competing against the S&W 2nd and 3rd generation pistols, SIG, as well as the then fledgling Glock proved extremely challenging. IMO the later versions of the P series Rugers were good firearms and I have an admiration of them.
Skipping ahead to the present, it seems to me that once again, Ruger is far behind the curve. The RAP is relatively unremarkable in that it is yet another polymer, double stack, striker fired pistol in what is an already over saturated market dominated by Glock, S&W, H&K, Walther, et. al. Although I have no experience with the RAP, it would not be surprising if it proves to be a solid, functional, durable design. However, I would be surprised if those qualities are enough to actually achieve a significant market share.