Dhoni is not like the Dhoni of old. He is not a flamboyant batsman anymore and his mindset has become mature almost overnight. He is ALMOST boring with the bat these days although we can't count him out for a second.
I disagree that Dhoni has become boring with his bat. Less flamboyant? Maybe so, but his maturity is keeping him from making reckless moves that could just as easily go against the team. And while Dhoni is a valuable player, one man does not make the team.
Dhoni is certainly a very good player, and a crucial part of the Super Kings, both for his great playing, as well as that certain type of in-game leadership that he offers to his team-mates. Although perfect he may not be, he still is somebody you can count on to deliver.