Moderation note: I have moved your post to a new thread, and considering the criticizing nature of your post — a bit acerbic as it may be — I’ve put it under the Feedback category. The thread you were initially replying to was not yours — which means that technically, you were hijacking it — and had already been abandoned two months ago.
Please don’t judge the whole distribution based upon one component — which, granted, opinions are divided on. Manjaro is an excellent distribution, and the fact that it’s curated — while Arch proper is not — makes it even more stable, in my personal opinion.
On account of pamac however, as you noted, most of the time, the CLI version of it works well, even though I personally only use it for the AUR stuff. For the repo packages, I use the tried-and-trusted pacman, and I strongly advocate using pacman in a tty session — as opposed to a terminal window — when it comes to a full-scale system update, like the one we had today.
The pamac GUI is however quite a problem child — I personally never use it — in part because its developer/maintainer isn’t always available for fixing things. But just as it has its detractors, it also has its fans, and thus the opinions about pamac within the community are highly divided. It’s a fact, and I’m not going to lie about it.
Hopefully however, this topic — and the one it was forked from — will soon reach the pamac developer’s attention. 
