Okay, so for full clarity i barely managed episode 1 i have had anime in the past where i could not push past the first episode and it usual came from one of three things.
1 - the artwork is severly not to my tastes.
2 - the Voice acting is realy jaring
3 - the writing seems lazy contrived or just plain boring.
within regards to high guardian spice its art is bad, not awful just not to my personal tastes. its remenicent of "Anime" art found in old how to draw anime books written by old american artsts before the hobbie took of in the est and this artstyle is similar to that, the character designs feel a little bland and the artwork looks simple, again not awfual just not to my tastes.
The voice acting seems fine, i don't have any issues with the voice actors and they seem on par with that of Shera but the writeing appears to be so much worse and the paceing seems so off, with a large part of a 30 minute episode filled with silent simple world shots of them traveling, with no real context or weight for them leaving. then there was a jaring set of still images flashed one after the other that for a seccond made me think it was the worlds worst OP before it then cut to the actual OP which felt dry and again a little bland, but personaly im not one for OP's so i was just thankfull it was short.
Save for the poor writeing and the bad art choice the voice acting and animation seems good, there was a nice looking sceen with two bird things, the animation seems well done in spite or perhaps becuase the simple artwork, but unfortunately good acting and animation can't pull the waggon of a story.
Overall score 2/10
TLDR: Voice acting and animation fine, artwork i feel is a little bland and writeing and paceing needs alot of work, won't be watching or wasiting much more time on this.