Looks a lot better than most tile jobs seen on here.

Bullnose tile is different sized than field tile. They didn’t “give up” on doing the staggered joint pattern. It is not physically possible to maintain a staggered joint with the bullnose sizing offered with your tile.

The different sized tiles surrounding the niche are a function of niche size and again, bullnose size. Of course they had to cut tile to make it fit.

No, the corner is not perfect. But the corner gaps are not at all “large”, and will be properly filled with silicone caulk. The tile cuts wrap the corner properly, and everything looks plumb. That’s pretty good.

The tiny tiles above the bench are a function of the bench height. They will be hidden when the builder retroactively installs the stone top, which he should do without fuss.

Chipped tile in a corner that will be covered by caulk is fine, unless it is excessively jagged. No cut tile should be an exposed edge. It should covered with bullnose, pencil, or Schluter trim. If it’s exposed, that should be popped off and changed

If that shower is properly waterproofed, this is very much a passing grade. Especially so since this is a builder project. They are notorious cheapskates who won’t even pay the lowest going rate for a “tile guy”, much less paying a professional tiler.

You are pretty off base with the majority of your concerns. There is certainly zero reason for a tearout and redo. Unless you just want to pay for that.