I've gotten Pantheon working on Arch before. The main issue issue used to be Cerbere, but that was back in the Isis alpha days. Now that Luma has matured, it's fairly easy. Just takes a little time.I enjoy keeping my desktop clean and I LOVE the elementary OS look (however Pantheon doesn't run on Arch, and i'm not really into using 0.3 again) so i tried to get close.
I'm happy with how it looks right now.
https://wiki.archlinux.org/index.php/Pantheon#Installation
Though, when it comes to Arch, I typically avoid DEs entirely since I gain a huge sense of self satisfaction by configuring a standalone WM and panel from scratch. I guess I'm just that pretentious.