Wait, why no photos in V3?
All The Reasons We Hate V3!

And, as Capt.Pike pointed out, even semi-frequent openings are not select-able in V3: B17 (Caro-Kann: Karpov Variation) is something I enjoy starting off as. No longer is it select-able in V3, where V2 still permitted it.

In V3, the background changes depending on who's or which club's page you happen to be visiting. In some instances, that can be quite a challenge to the eye.

If enough people report the same thing as a bug, I'm pretty sure that would get the development team's attention.
I'm getting the impression you only wish to hear about bugs and do not appreciate feedback.
Here's the deal though: listening to customer feedback is important for YOU, not for us.
Just trying to brush off people giving feedback will accomplish nothing except cost you valuabe insight how your companies' efforts are being seen from the outside and causing frustration to those customers who take their own free time to gift you some free market research.
Asking those same customers to invest even more of their free time to say the same things again at a different place just because the company is too lazy to deal with the feedback here is not a good practice - neither for you, not for your customers.
It's lose/lose and should be avoided as a classic fail.

I use a custom theme anyway--which I understand is unsupported in v3, and there's no intention of changing this--so if it just switches colors, that's kind of... not useful.
WAIT. Waaaaaaaaaaaaait wait wait wait wait wait. David, are you saying that if we flood the v3 bug report system we can indefinitely delay v3's release? :3
If a bunch of things are reported as bugs, that aren't bugs, I doubt it will do anything much.

For forum content, just use the My Topics link on the forum pages. I use it daily to keep track of stuff I have posted in.

As far as I am concerned, V3 is still unusable. It's clearly aimed at mobile device users, but still it's a bughouse deluxe UI.

Maybe V3 is just a social experiment. Maybe they want to see how long it takes to the average human to give up and stop using chess.com.
because
I don't know how many times I have reported the engine analysis problem and for how long, and nothing has been done. I take that back. Nothing useful has been done.
New bugs arise, old ones keep being there. I only use V3 now to do the tactics, and sometimes it crushes...

V3 doesn't let me sort chess mentor courses like V2 does. I am trying to study the courses from easiest to hardest. Now how am I supposed to do that with V3 being forced soon?

Completely unrelated stuff, but why does cc restart the live chess servers every 3 days?!
https://www.chess.com/forum/view/community/why-restart-so-often?lc=1#last_comment

For the moment I have nothing to add. I'm just reading with pleasure. All of the grumbles are justified and I'm sure I could come up with more.
Icons not words - taking time to understand what is going on
Harder to navigate (or just VERY unfamiliar)
Loss of intuitive sense of navigation (like Windows 7 going into Windows 8!)
It's been a while since I tried it but I have the recollection of trying to do in live chess, things that were so simple in v2 - and that I simply couldn't do in v3 - can't really remember which - but I do remember trying to do them, and having "unwanted function" just jump and get carried out instead of what it was that I was trying to do...
So no like.
I could not use the Opening Explorer anymore to drill down to see strengths/weaknesses in moves any more in V3. V3 is just a bunch of pie-charts and general stats. I prefer the V2 version of the Opening Explorer.
And many of the openings are gone from V3 Opening Explorer. Zuckertort (1. Nf3 Nc6 2. Nc3 Nf6) is now listed as "Reti" (technically correct) and I can't pull up Zuckertort for tourneys, matches, vote chess; etc; though I can use Custom FEN, LoL (which is a nice feature; custom FEN; but not sure if its worth the trade of losing all that information).