I'm really torn on this subject. I've wrapped my head about D&D abilities and have started to include them into my adventures (or not), depending on my PCs. I have no issues with spells like speak like dead - I sometimes even require them. But I've learned it the hard way and learned how to deal with it - not without the help of some nudges from Monte Cook's articles on his old website.
On the other hand, I've seen DMs fumbling with stuff like that, especially newer DMs and/or DMs, who draw heavy inspiration from other fantasy sources - novels, settings, whatever - and would run good games, if not for these abilities.
Now, 4E has definitively tries to draw on new audience, so I see why they want to get closer to classical fantasy - and nothing bad in there. But I also see that people who are used to it and especially "Tacticians" (as defined by Robin's Laws of Good Gamemastering) are annoyed by it - they lose their tools to circumvent the plot. And that's bad for them.
I guess that's due to the "Buttkicker"-ification of D&D. But in general, it's not bad, just a shift on playstyle. But I see where Derren is coming from, but then, we don't know how customizable D&D will be: It is possible that a lot of these Tactician-tools are coming back in the form of rituals, regulated by the DM. Or coming later, perhaps in books like Mouseferatu's Advanced PHB.
EDIT: I've looked at your sig, Derren. That booklet is worth much more than the some pennies you have to pay for! And I guess 4E is, more than ever, dependent on a good DM, if you're not a buttkicker, so that Tacticians can get their kick. Right now, it's more geared towards buttkickers and casuals - but then, they are possible more common among D&D players. And MMORPGs are popular, because they appeal to these groups - if D&D can tap that playstyle, I see why it's good for the game - there are a lot of these guys out there!
Cheers, LT.