No amount of complaints will change the system.
There are numerous USCIS internal reports that highlight a series of issues throughout the process and go in full detail about the possible solutions. Nevertheless, the issues continue and have gotten worse.
The most prevalent problem is precisely what you pointed out: cases are not processed in the order they arrived and the wait for your case to be "touched" can extend indefinitely.
Funny enough, actually reviewing and approving a case is quite fast -if all the requirements are properly fulfilled at that point-.
The WoM forces the USCIS to take a decision, and even though it will indeed move things, there is a risk of it backfiring, e.g. if a very important document is missing when they proceed with the mandamus request, the reviewing agent can decide to deny the case rather than issuing a request for evidence.
That being said, the I-751 does not need a WoM; filing for naturalization will get things moving, so if you're stuck at the moment, just file the N-400.