But they aren't in any way central to my enjoyment of the game.
For me, I've always liked 4E because of its structure and how easy it was to expand on that structure in a balanced manner. Additionally the steady improvement in nearly every book - with Dark Sun and Psionic Power being two of my favourites (coincidentally, released right before Wizards clear decline IMO).
What's bothered me in the past is what I have seen as an over-abundance of negativity and fear-mongering
To be frank, it's because I have nothing to look forward to anymore. There is no Dark Sun this year. There is no Eberron (from the previous year). There was no "Just about everything" like in the first year (albeit in fairness that would be hard to reproduce, as the system was new and I was excited to see where it went!). I
should be endlessly excited about Threats to the Nentir vale. I mean the preview they showed absolutely 100% knocked it out of the park.
Yet I'm not and it's because I know they are going to screw epic tier again - the tier that desperately needs the most new monsters. At this point I'm sick of Wizards not communicating. If they aren't going to support epic tier, just damn well admit it already so I can cease bothering with trying to run epic tier games anymore. 20 levels of play is a long and satisfying campaign - I plan for epic now because I hope they WILL support it. If they have no intention of doing it anymore, I'm really not going to put in the huge amount of work required for it (which is a shame, because I really want to do it).
This just really annoys me, because the sudden complete removal of epic tier monster support was sudden and without warning. MV just had nothing and Threats to the Nentir Vale is doing the same thing. MM3 and Dark Sun: Creature Catalog gave me utterly no warning they had suddenly decided epic tier was unimportant. In fact MM3 seemed the opposite: Epic tier was finally getting support it needed in the form of rank and file monsters, new antagonists.
Then the change of direction came in and babies were thrown out with bathwater. Some people saw this coming a mile away and I argued with them quite a bit they were just being paranoid. I feel pretty stupid now they have been utterly vindicated and I was utterly wrong I can assure you.
To the other point you made after this: They're in a lose/lose either way. At least one way is the manly way to lose by being honest.
See, if they didn't play the class because they didn't like the options available
You have misinterpreted me: They didn't play it because the options are limited
and they aren't going to be fixed any time soon. I've bought up this point before, why play a runepriest that will never see any support and is viciously short on options, instead of that "Publish everything new for them!" cleric?
There is no reason.
But the DMG3 has to justify the existence of the DMG2 first - and a lot of people gave that book a pass because of the DM advice content, and a lot of people gripe about all of the errata and re-printing of rules...
I think you'll find that there is a widespread agreement for the new monster design guidelines - many of the ones they haven't collated in any errata anywhere but on personal blogs etc - in one book. Also I'm not sure if you're confusing the DMG2 with the recent DM's Kit. The DMG2 to my memory was widely praised actually, but the recent DM's kit was written off as a bunch of rubbish reprinted from the DMG/DMG2 and largely worthless. I've never read anything majorly negative about the DMG2 and so this is entirely surprising to me. I mean it's the DMG, it has a lot of DM advice in it and it's widely considered very good advice. What on earth were people expecting?