Are people seriously suggesting that the Prophet of Truth in Halo 2 was bad and forgettable? That Halo 2's campaign story/dialogue was
forgettable?
I mean come on! The dialogue in Halo 2 was superb, especially near the end of the game when the Chief was rampaging through High Charity. The music, atmosphere and the dialogue was one of the best moments of the franchise, in my opinion. You were fighting through nice vistas while the Covenant was crumbling around you.
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This thought came to mind; the Didact and the Gravemind are actually really similar villains.
-Both show up unexpectedly, and rarely physically manifest themselves.
-Both telepathically communicate with the Chief.
-Both are reliant on an army of "mindless" Prometheans and Flood respectively.
-Both of them are incredibly cocky and rant on about how they will win.
-The Chief/Cortana defeat both of them by exploiting their cockiness with a twist at the end of Halo 3/Halo4.
Honestly, this is why I think that Truth in Halo 2 was the best villain the franchise has managed to produce. He was intelligent, deceptive, and calm, had very good voice acting, and also had fantastic dialogue. I didn't like Halo 3 Truth's voice actor, and he went from calm and deceptive to unsettled and downright crazy.
The problem with Tartarus (aside from his very fun boss fight due to all the glitches and its general silliness), was that he was more of a henchman then a villain. He was never meant to be the main villain in Halo 2. He shared a rivalry with the Arbiter, and symbolized the rivalry between the Elites and Brutes. However, his antagonistic nature was not important to the plot as a whole, not least compared to the Gravemind and Truth. This was an intentional move on Bungie's part, so it is a little unfair to compare him to the villains in the franchise.
I'm curious as to how Halo 5 is going to handle its main villain. Halo is not exactly known for its villains, although I wouldn't say they are bad characters.
They just needed more game time
Perhaps greater time should be spent exploring a character's motivations? Halo 2 and Halo 3 didn't need to spend much time in this regard, as the motivations of the characters were obvious and lined up with the factions directly.
On the other hand, the Didact's motivations in Halo 4 needed elaboration. EU integration is nice and welcomed, but IMO a Halo campaign should not be reliant on the EU to explain major plot points. The Terminals and the Forerunner saga gave an indication for the Didact's motivations, but I felt that this could have been done better in-game.