Yes, I'm also very unhappy. Last month I started to search for home server solution. Mainly as a backup for photo/video archive, plus some docker and couple VM's. First I wanted to buy QNAP, but changed to fan-less design and better hardware. So I started to search all possible software solutions. UNRAID still remains my favorite. I tried OMV and Proxmox. OpenNAS don't want because of OpenBSD.
But SMB performance is bad. I expected to run some projects over 10GbE from NVME. But was very disappointed waiting 20+ hours for my 450GB Apple Photos library transferring to UNRAID.
Now I want to try custom linux build. I don't need any kind of parity or RAID. Will just rsync the data from one 10TB drive to another. Probably, I will try LVM cache with NVME to the main HDD, because UNRAID cache is also not what I expected.
But I like UNRAID UI and Docker/VM management. Theoretically, I can live with performance issues, but generally speaking, I would like to have more support from the devs. At least some acknowledge.