Can't argue with that - the facts speak for themselves.
For what it's worth, the best (and worst) "threequel" was Dead Space 3. It surpassed the other two in story, set pieces and high-end graphics, but was hamstrung by the worst Save-Game mechanism in gaming history, just because they wanted to have a real book-style storyline AND have it multi-user. The result was utter chaos and a beautiful game was crippled beyond repair. They tried to cobble together a patch but it was too little, too late.