If your wot calculation depends on no false positives, it won't work, sure. Set a threshold, incorporate mutes/reports, show a number, etc. Lots of ways to improve the most naive version.

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Lots of ways to game the WoT score as well. Especially with leaked keys from real humans becoming very common. There will be a market for WoT keys that can be changed to impersonate somebody else.
Yes, everything can be gamed, in theory. In practise the game can also be cheap to play for the defender, and expensive for the attacker. The game also does not have to be static.