Hmmm...the thread seems to have ballooned, but I'll post as much rebuttal as is humanly possible.
Here's a good place to elaborate and thereby gain credible support for your thesis. Give us some bullet points explaining briefly and succinctly why the anibuffs are now near-worthless. Horrid Wiliting was certainly quite horridly OTT previously, so let us know why toning it down went wrong. Might also help gain support if you explained what was actually done to hamper it. Disintegrate barely worthwhile? Heard it did ridiculous amounts of damage now. Ridiculous damage doesn't sound barely worthwhile. What's up with that?
Okay, quickly speaking, I think that Elder-Basilisk posted an excellent analysis of why the anibuffs are now nerfed. The whole point of the anibuffs was duration, not power. WotC kept power, but nerfed duration, hence neutering the whole point of the spell.
As for Disintegrate, it is now 'barely worthwhile' compared to comparable direct-damage spells. Now only does it require a ranged touch attack roll (not always guaranteed with the average 11th level wizard only having a +6), its damage is comparably anemic. 22d6 save for 5d6 gives an average 77 damage on a fail and 17 on a save. Maximised Fireball does 60 points on a fail, and 30 on a save- and requires no ranged touch attack, and affects multiple enemies. That is why Disintegrate is now barely worthwhile. Incidentally, the Max. Fireball also forces a massive damage save, so Gothmog's point is invalid. 'Power Munchkin', as Psi(Severed Head) so...equolently...put it, would be far better off going down the assault line.
Horrid Wilting is weak at the new power level due it not matching other damage spells. Given that epic is non-core, it now has an effective damage cap of 20d6. This is comparable to Delayed Blast Fireball, at a level lower, assuming that non-elemental damage and the delay function are comparable. It is less than Maximised Flame Strike, at a level lower at a flat 90 points, half of which is non-elemental.
I mostly disagree with this one. While I know WotC reads message boards; and even takes them into account when deciding what changes to make to the game; I also think playtesters/customer feedback play a much greater role into how WotC changes the game. I have no formal proof or numbers on this; I am just basing it on the fact the it is well known how much playtesting and Customer feedback went into 3E.
Customer feedback, by and large, will be coming from similar people to messageboard-users. The more serious end of the gaming market. Casual gamers don't feel the need (in general) to phone customer feedback and give a blow-by-blow account as to why the d8 damage dice on a Horrid Wilting distorts the power curve in favour of wizards. Playtesting is well and good, but if it wasn't picked up in pre-launch testing, I would still be inclined to believe that it was as a result of post-supplemental playtesting that the problems became apparent. The point about playtesting, however, is merely analytic speculation (since I've been told to mark it clearly

).
I disagree. People only really started complaining about wizard supplements when the FRCS was released, due to that Spell Power.
FRCS is a supplement, and one which I banned almost immediately. You only underline my point- the supplements are too powerful, not the core rules.
Scion of Vyshaan- I agree with you entirely. People on the messageboards can get far too emotional at times, and often flail out widely. I do sympathise with your predicament. I've had to defend the save-or-die spells
Thesis or hypothesis, Al's theory explains a lot. And his analysis of the result seems, to me, spot on.

Thanks
The irony is that for all of the 'pro-nerfers' demands for rational argument, ultimately they often fail. Whilst they can still be on solid ground, such as with Harm and Heal, the arguments are clear and cogent. But I've yet to see a clear and detailed analysis as to why Horrid Wilting is broken (and please don't even mention the suggested level caps, as nearly every spell in the book breaches them) and why Disintegrate is broken. Jumping up and down as shouting 'Power Munchkin' isn't helpful, and can often be offensive. Scion's sentiments are all too true.