It is not that simple. Tor is not the best, but it is good enough. And it is usually the users' faults they are identified, an error on their part.
And this is very important topic because:
1. Makes Tor #centralized in aspect of decision making who will be able to be any other type of node, and introduces TRUST in 3rd parties in #anonymity system.
2. And whole network depends on ~10 servers, that can be hacked/controlled by NSA/GCHQ