I don't think the type or brand of system has anything to do with the problem. ANY!! Public Safety radio system that fails is unacceptable whether digital or analog or trunked or conventional or even if it is VHF ,UHF or even Low Band. Too much emphasis today is being put on building unmonitorable, digital,data capable, and trunked systems. In my opinion the technology hasn't developed yet to provide these systems in a Public Safety quality (KISS ala NYPD). Fortunatly most analog conventional systems are resiliant enough to keep on working when a single point of the system fails, not so for trunked systems, and as they become more complicated, so does the tendency for them to fail, and fail big time. Maybe using your cellphone for talking to you spouse is ok when it fails but when PS radio fails people can die.
Another issue is using 800 mhz in the woods, which is not a smart application of radio resources, it takes nearly 8 times the number of transmitters and receivers to provide the same coverage as VHF. Cross patching in itself is not a problem, but when you put large amounts of radio traffic on a patch, things will get screwed up. Also all it takes is one radio to get stuck in transmit to take the whole system down, couple that with digital, which doesn't exhibit the same capture principles as FM, and you whole multi-million dollar system becomes useless.
I believe that ALL public Safety systems should stay analog and conventional.(KISS) You want data capabilty, build a seperate system for it, so if it fails, then you can still use you analog conventional voice system. If radio traffic exceeds the conventional system, build a simple, localized trunk system. You want to talk to someone across the state, use a cell phone. There is no reason why someone at one end of the state NEEDS to talk to the other side.
Unfortunatly radio system design is being driven by the vendors not the agencies that use them, they are being given a myraid of options that most don't understand or need and would never use. Replace your equipment as needed with the same type to meet any FCC deadline, but don't change the type of a working system you have.
It will take the deaths of numerous PS personell and civilians before that principle is recognized and maybe implemented. (remember FDNY and digital) There are 2 main problems out there, one the vendor will never admit that there system has issues, and two you will never, ever, ever get a public official say they made a mistake when they chose the failing system.