It has been suggested that a lack of responses on the 'angels are intrinsically good' side is somehow an indication that the point of view is not wide held, or is in some way invalid.
So now I try to respond to this line of argument while trying to make it clear it is not a personal attack, and trying not to discuss religion event while discussing an iconic concept from several modern-day religions, which some posters seem to think are open to attack.
Oh, joy. And people wonder why we don't post.
Let me take a deep breath, and try to order my thoughts.
First, a reminder: Many Christians play D&D. We are a part of the PnP game market, which is (let's be honest) not so large that WoTC can afford to put any part of it offside.
All the effort we've gone through in the last 30 years to try and un-demonise not just D&D but this entire hobby, and now WoTC pull this bone-headed move...
*sigh*
Anyway, to firstly answer the question of who defines an angel as being good:
When was the last time you heard the compliment "You're an angel" sincerely (sarcasm doesn't count) directed at someone for performing a morally or ethically ambiguous act, let alone a reprehensible one? I know I never have. It's only used, in my experience, to praise someone who has acted generously, perhaps even selflessly. Hardly divorced from the concept of good.
Western culture thinks of angels as good. Even secular fiction uses them as symbols of good. The whole impact of a story in which one falls (or has fallen) is meant to stem from the corruption (impending or past) of something that is pure and good.
So trying to present angels as being by default something other than good may also strike a discordant note with the general public.
So my response can be summed up as: Mainstream Western culture defines angels as being good. Yes, there are examples to the contrary but the entire aim of those examples is to provoke thought or emotion by going counter to that expectation.
Let's try inverting the perspective. Would you be as complacent if WoTC released a preview announcing that in, say, 4E Forgotten Realms devils and demons were going to be the good guys? Would that be OK because it was 'edgy'? No? Then why is it acceptable to mess with the morality of angels? And before anyone accuses me of hyperbole or extreme examples, I will point out that the religions that use these concepts have them very much in opposition to each other. Either change is equally jarring, and equally controversial to followers of those religions, and to a lesser extent to mainstream Western Culture as well.
Secondly, an argument was used that angels are present, but not good not good in other religions'. My response to that is to agree that other belief systems have similar concepts for their deities' messengers, but I guarantee that they did not use the specific word 'angel'. Some translator substituted in that word to draw on concepts familiar to westerners. Previous editions of D&D managed to address this very nicely by making up a fictional entity that was only partly inspired by the concept of an angel. If the word 'archon' or 'deva' had been used for the new generic celestial messengers in 4e, no-one would have batted an eye. Instead the 4E designers chose a word specific to a single set of beliefs, and which furthermore is strongly tied to the concept of good.
To put this further in perspective, if 4E had used a prominent component of some other widely-followed current-day real-world religion and tried to change his/her/its moral significance, who here thinks that there would not be an outcry once the followers of that religion became aware of it? I'm sure we can all think of more than one example in the past couple of years where it has been abundantly clear that followers of religions other than Christianity are also capable of taking offense at what they perceive as misuse of their icons. I doubt anyone would say that, in hindsight, the misuse itself was a smart move. If it's not acceptable to misuse icons of other religions, does it not follow that it is similarly not acceptable to misuse Judeo-Christian ones?
Finally, to those who excuse the deconstruction of angels by citing previous examples in fiction: If we return to the example in my prior paragraph, would quoting prior examples of said icon use in pop culture and recent fiction do anything to calm the situation? Based on what we've seen, it would be more likely to add fuel to the fire.
I do not believe that Christianity is less deserving of respect then those other religions.
I have no problem with there being unaligned (rather than good or evil) messengers of the deities in D&D, but to suddenly change their name from a long-used D&D-specific term to a concept from a specific religion, when such a name is not a good fit and has the potential to be inflammatory, strikes me as a poor decision.
I'm not sure if I've manged to present this without offending anyone. If I have, I apologise.