it is 4" right? So 480x800 isn't much worse than what jolla have. Or some other cheap 5" phones out there.
512 MB RAM is twice as much that N900 have and I still use it and it is still usable. And it can multitask with 256MB.
Camera was never a dealbreaker for me.

I don 't know, it all comes down to price at the end. Give me that one for a 100€ and I'm willing to try it. But I'm not sure that I would give 5 or 6 hundred for a top notch HW just to try tizen.
After all, powerfull HW with crappy SW is still crap. I have 2013 Moto G without all that moto/google bloatware and in normal use is much better than galaxy 5 with that terrible touch wizz.