A hell of a lot of Army OH-58s doing a lot of safe flying out there. Most were used for instruction at Rucker. You saying the Navy could not.maintain their -67s as well?
The Navy 57 fleet has a lot more time on it- many of them are over 20,000 hours while the Army's 67s were a little over 10,000 when they got rid of them for their Lakotas.
The 57 fleet has a lot of old age problems like water intrusion into the instruments and avionics, no spare parts for the autopilots (IFR birds). When I last flew them seven years ago, the problems de jour included doors popping open in flight (yes, you can write it up and mx adjusts the door), engine oil coolers that weren't up to snuff (oil temp would run right at redline on hot days or exceed it in a hover and climb), a particular fuel fitting under the engine that would commonly weep, unexplained delayed engine spool ups on some, mild compressor stalls on others...
A day in the life of a VFR TH-57, I used to make tic marks for each landing (normal landing from a hover, sliding landing, hover cutgun, taxi cutgun, full auto). My record on a 6.0 FAM triple was 72 tic marks- not counting power recovery autos and waveoffs (or other times we otherwise ran the engine down to idle and back to full power). I remember when a lot of the aircraft had that fuel weep problem and one of the NAVAIR engineers said that civilian 206 operators weren't seeing the problems we were having. In my opinion he failed to grasp just how hard we fly the things.
Some flight hours work more like dog years. I don't think it's a question of good or bad maintenance, it's a question of what is possible.
(Last, it's not like they're not working to solve these kinds of problems as they come up, but they have same the resources and will that they used to address the OBOGS/pressurization/physiology issues on other T/M/S (just an example). But even if they did throw more money at the fleet, it's past diminishing returns at this point.)