No.
ATCs can be excellent and can be poor - just like any MD.
The best way I can describe an excellent-to-good ATC is the equivalent to a PGY2 PM&R resident (or good FM PGY3) in diagnosing MSK issues. Pretty comfortable with easy things like patellofemoral pain or obvious shoulder impingement, but once it move to anything beyond that the thought processes and differential breaks down quickly.
ATCs are excellent in the space they operate - communicator between player, coach, and MD/DO; know the athletes on a very granular level; lubricate the wheels of healthcare for the athlete to get studies and therapies performed; perform basic PT and modalities. They also have skills that most MDs don't have such as taping various joints. However most of their exposure is standing at practices and seeing some athletes in the training room .... vastly different than medical training and seeing patients in clinic. All the best ATCs know their limitations and when something is more than DOMS or minor "tweak" and to move up the chain of knowledge .... just like any good physician should.