IMO, the new messaging system is a big improvement on the old one, it just needs a few fixes which are already in the pipeline.
As a player-base I think we could support the devs in their efforts rather than slinging trash at them all the time. When you're working, it's not much fun being bad-mouthed by the people you're working for - just imagine being in their shoes! If it was me, I think I'd end up hating the job.
Points where the new messaging system is superior to the old one:
1) The letters are sharper and it is easier to read;
2) The old messaging system kept losing threads - I was forever having to refresh to find lost threads, or having to bump threads for guild members who'd lost them. I've not lost a single thread since the new system came out;
3) In the new system, I love how my entries in a thread are arranged on the right side while everyone else's are on the left; it makes it much easier to find my last entry - very useful in never-ending FP swaps, where I can find my last donation, copy/paste it, then copy/paste the last donor's request into the appropriate spot. I can get away without any typing, lol;
4) The way the new message system highlights unread messages is brilliant;
5) Being able to leave a thread altogether has been useful in a couple of worlds where I was still receiving ongoing threads from guilds I had quit;
6) Last but not least - being able to chat with guild members on mobile is something that should have been implemented long ago. Those who say "go back to the old system" may not be aware that a huge number of players on mobile had a "coming soon" on their messaging system for over a year! So they had been waiting a long time for this, but I imagine the untimely death of the lead dev may have had something to do with the delay. In one of my guilds, there are quite a few members who play almost exclusively on mobile, and as a guild leader it was hugely frustrating when I couldn't let a new member know they needed to fix their trades to make them "fair". I had to resort to kicking them from the guild just to get their attention, so they went and logged onto a PC to find out why they'd been kicked, and then they had to wait for a whole week before they could rejoin. So I for one am ecstatic that they can now access messaging.
The only problem with the new messaging system is, it does not allow players to tidy up their mailboxes, but that is being worked on and is already in Beta, so we should be getting the fix soon. It's not that hard to avoid "leaving conversations" until the fix comes through!
The other really brilliant innovation that is on its way with the new system is the ability to edit the recipient list. That will be a huge bonus for guilds where there are several ongoing threads.
In one of my guilds, besides everyone being able to start a thread, we have quite a few ongoing threads, including two never-ending FP swaps, a GvG map guard, a GvG donation thread, a BP hunters' thread, and sometimes others such as muddies, trades, tip-of-the-week, guild news, etc, which I have to restart every time we have a change in membership! I am SO looking forward to being able to just edit the list of recipients!!!