The truss rod is the perennial scapegoat of guitar problems. The reason for this may be the fact that it's easy to access and requires only one tool to adjust on most guitars. Virtually every guitar is going to experience problems related to a truss rod on a seasonal basis, but some guitarists blame it for everything from weak tone to faulty tuners.
The only problem that any guitar will have that can be fixed with a truss rod adjustment is neck bowing. Humidity and temperature changes are the primary causes for bowing, and any piece of wood is going to be affected by them (just like a door that tends to stick in the summer).