I'd have to say yeah, the endings of DE:HR basically follow the same path of being disappointing and not really amounting to more than variations in the ending narration. Eidos' decision to make it a prequel meant that there was no way to give a satisfying ending, but instead had to settle for four endings that are vague enough that it's possible for any one of them to lead to the world that Deus Ex exists in years later.

That said, I enjoyed the game and the ending aside, it is worth a play. It's sort of that ME3 dilemma: The game's great...right up until the last 10 minutes.