I have two regular groups. My main regular group wasn't thrilled about 4E, but they were willing to give it a try. At first, I was upset when it came out, then I heard things about it I liked, and finally, I decided to try it out.
I ran the Keep to the end. It fell flat. Every combat was a slag, taking a long time. But that really wasn't it. I was actually at first looking forward to lots of exciting, but balanced combats.
What really sealed it was no one was spending any time with their characters between games. No one cared. I think everyone I play with (including me) are tweakers - we like to fiddle and plan and exploit the rules for interesting character concepts. We like to try all sorts of strange and interesting things - we've been playing a long time now - almost 20 years. And it just doesn't seem like you can do that in 4E - you are on the rails and you can't get off.
I know the reason for this - it is all about game balance. Yes, 3E and earlier editions had balance issues, particularly at higher levels. But at the same time, that was part of the charm, seeing just what you could do. I once made a character with godly jump and climb skills and had all sorts of fun with that. You simply can't do that in 4E. Every character in every class is on the rails. Same number of powers per level. No prestige classes. No real multiclassing. No real options but what is on the rails.
4E was sure easier to run as DM. And at the same time, even I as DM was ultimately bored and just wanted to get it over with, though we played it out to the end anyway, to give it a chance. This was despite being excited to try it out and see how it went. The balance is so tight it feels like a straight jacket. It makes me think of the move The Incredibles - if everybody is special, then no one is. No one can shine. No one can get off the rails.
It also just did not "feel" like D&D anymore, perhaps because it was so tightly balanced and D&D never really was. That modularity, that freedom, that feeling you can do anything, just is lacking.
So in a sense, we all were "forced" to try it - by ourselves. And we did not even need to discuss it by the time we ran the last session. Without saying anything, we all knew the next game we ran would be 3.5E, and that we'd not be returning to 4E. I cancelled my preorders of 4E books on amazon. I've been in the habit of just preordering everything to be releasd every six months - I'm a book whore, I admit it. But no more. I also will not be going to D&D online because that is all for 4E and I simply won't be playing it. Wizards has probably lost me as a customer for any of their new material forever. Though I still will probably get minis if I like them (I have a lot) for use in my game, since obviously those are usable with any system. But if they start tailoring them with new monsters that are only in 4E books, I'll stop buying them as well.
I was sad when Dragon and Dungeon ended. Now I'm sad that it feels like D&D has ended as far as anything "new".