Yes, yes, we should all definately fear that a Cleric, a worshiper of a God, can call upon his god's knowledge and call his god's friends sooner than a Wizard can
As for whether a buffed cleric is a clearly superior fighter to a fighter of the same level, I am still very doubtfull. Also, those buffs mean the cleric doesn't really have any other powers left to use, if they buff themselves....it's also temporary, whereas a fighters' powers are permanent....I may be swayed with some numbers, but even if it turns out the buffed Cleric is 'better,' I'd say that it doesn't prove much, what with the temporariness, and the cleric having to basically use all their class powers to get there (and then not having healing or damage-dealing left).
Wizards deal more damage. Clerics certainly aren't pointless in the area, getting some damaging and potent death-dealing magics, but they'll pale before a wizard of the same level in their ability to kick butt. To compensate for not being able to kill things with magic, they're at least somewhat competent in melee.
Otherwise, as far as I can see, a cleric excels in the things it's supposed to excel at (like calling servants of the gods, power over life and death, making the party stronger, and in using his god for advice), and remains competent in martial skills to boot, simply because their powers are all very limited and/or unglorious.
It looks good on paper, but in play, you have a buffer/healer who isn't a burden to the party. You can have a cleric devoted to ass-kicking, but their spells are going to pale before the Wizard's, they're going to be less skilled at what they're usually depended on for, and the only thing they get to compensate is that at least they don't die with a strong breeze like most Wizards.
If you're looking for a cleric that can't kick ass, take a look at the white mage. I assure you, I didn't nerf the class in the slightest (basing it on the Cleric), and most people who've played it still think that it's kind of weak, despite all the nummy healing and protective and buffing goodies it has.