It's so hard for me to comment about it being subpar, because when I look at the whole picture, it just looks stunning to me, and it's not even glass tile (I don't think....)! If I'm required to look very closely at the close ups and required to be picky, then I do see some things. On some pictures (# them next time), it looks like some sections were done by different guys with different styles. For instance in one inner corner seam, the tiles are trimmed along a line (somewhat) on each side of the midline of the seam. On another inner corner seam, the tiles on every other row cross the midline to the left, and then to the right on the alternate rows. Wish I could draw on the pictures, but I don't think I can. Neither looks bad to me, just different ways of handling an inner corner seam.
Picture #1 top - looks beautiful to me (but I don't install tile) A+
#2 - looks very good to me A
#3 - looks like two rows (4 tiles) should have been trimmed a hair; if it's waterline tile, it won't show. B+
#4 - grout work looks a little dirty and different widths in the seam; if it's waterline and inside corner, shouldn't show B
#5 - awwwww, I have a little tile just like that, and it's my favorite! (Kim, do you remember it?) Gotta love the lonely little crooked tile. When the Amish made quilts, they purposely made a flaw in it, because they believe only God can create something perfect. (something like that). Maybe your tile guy is Amish...... Anyway, it always helps be get over boo-boos. (no grade here, don't want to hurt the little fella's feelings)
#6 - (by one sheer showing) Well, not the straghtest of midlines, but at a glance, it all blends. (shhhhh, be sure you don't point it out to friends) B
#7 - (between 2 sheers showing) See my explanation in paragraph above A-
#8 - outside edge; If I had to pick, the top 3 grout lines are a little wide. Other than than..... I've had to line up a vertically patterned wallpaper on an edge that didn't nearly as good. B
#9 -Not sure here unless the left edge isn't as straight along the upper third or so. I'm not sure I would have noticed if I weren't trying or it weren't highlighted by the golden wall behind it. A-
#10 - 4 vertical grout lines on the outside edge going top - down are too wide. Is this in a focal spot where it is easily seen? Looking at the individual tiles, I'm not sure a fix would look better. Is that top part of the seam leaning to the right a bit in the picture? I'm not sure if it's an optical illusion. B-
#11 - I'd want to try to check if the hole was filled in or not. Maybe someone here can tell you how to tell. I know sometimes tapping and listening for a hollow place is one way, but you don't want to damage the tiles.
Are you too picky?? I don't think anyone can say. We all have different tolerances in our expectations. So many variables..... sight (like in near-sighted, etc), past experience (did you lay tile for work), where is the flaw located (obvious, not), how does it look when not scrutinizing, do flaws drive you crazy (hey, we all have our 'thing', don't we?)
Decide what you can live with and what you can't. (oh, never was I trying to make light of anything - it's just I'm not comfortable giving negative criticism - that's one of MY many things, Lol!!)