Greetings!
Gang, come on, now. When the poster--or any poster, really--says "4E has ruined my game!" or "WOTC...or those bastards! They've ruined D&D with this new edition! D&D is screwed now!" etc, etc, in the same way that they have made the analogy of the *House* or the *neighborhood*--by pointing out that they can still use their rules, and their particular *home game* isn't effected, well, really now.
You're being needlessly specific--and avoiding the more obvious and reasonable interpretation of what the writer intends.
You all know--or should certainly know--that such a writer means the overall game for themselves, their *collective* game, in the general sense.
If you really insist of being hyper-specific, and need the writer's unstated implications spelled out to you...come on. I know you guys are smarter and sharper than that.
Yes, 4E could be seen to ruin many people's D&D, from all of the many specific systemic critiques, to the more generalised:
(1) The continuous history of the game progressing through various similar *editions*--has now taken a radical departure. This vast transformation of not merely some rules clean-up, and modification, but rather sweeping changes to the whole foundational *system* makes many people feel that it is unconnected with the previous editions of the game, and it feels so hugely different, that it no longer feels like D&D to them.
(2) Discontinuation of future products for the edition they are currently playing; It's a general principle that when a particular game ceases to have main-line, *official* game support, the particular game essentially becomes marginalised, and withers in the general consciousness, and extending accessibility to other gamers. This reality can, for many--make it very difficult if not impossible, to run any future campaigns with anyone other than their specific current group.
(3) With the aforementioned dynamics, one's current library of vast 3E products then become in a sense *obselete* and dated, essentially limiting their use to such *retro* games. Only people interested in playing in such a *discontinued* and unsupported game, will now allow full use of such material. I'm perplexed at how to explain this precisely, but it becomes a sort of "closed loop" creatively for future campaign miliues.
I hope this clarifies and helps a bit. Personally, I really like 3x, and I am still running 3.5 campaigns. I am enthusiastic about 4E, and am researching it for future adoption at a later date, as I deem appropriate.
Semper Fidelis,
SHARK