I'm running an RB5009 with 7.14.2 packages and also the latest RouterBoard firmware. Its been completely fine for me.

Obviously YMMV.

Also avoid the Key Bridge in Baltimore for the moment, it's got, err, issues.

I am running 7.14.2 on 3 x CCR2004, 1 x CCR2116, 1 x CCR1016, 2 x CRS309, 1 x CRS310-8G-2S all without any issues.

As others have said YMMV but most likely something to do with your hardware or setup as I have not found it buggy at all.

@Shindig maybe share a bit more info, what device and what actually isn't working for you.

Mikrotik 4011 

Wireguard connection completely broke. Recreating the interface and peer made no difference.

NAT rules for incoming (dstNAT) on 443 to Traefik fully failed

DNS4ME Script I had running every 15 mins, now failed with not enough permissions

Reverted to 7.11

The same configuration now works for the NAT rules. Nothing else has changed. 

DNS4ME script works 

Yet to test WG. 

Did you go from 7.11 directly to 7.14.2?

If so, I suggest you read the release notes properly about the versions you need to install first.

https://mikrotik.com/download/changelogs#c-stable-v7_13