I'm almost afraid to ask - but what's underneath the tile? I just have a sense that someone who can't tile, probably doesn't have a clue about tiling, may know even less about waterproofing.

Well - you bought rustic tile and you got a rustic install 😬

In all seriousness, though. It’s a tear out and redo. I would be shocked if it is waterproofed properly given the competence shown in what is visible.

"Is this tile job repairable?"

No.

Its pretty bad. It looks like it all needs to be removed and get a proper tile person to redo it, and check out the waterproofing too. The tile will not be reusable.

It looks like I'm the only one who thinks it can be redeemed by scraping out the grout and reqrouting. It's still going to be a little wonky with that style of tile.

I really appreciate everyone's input..thanks so much.  We did expect the tile to look wavy and we're ok with that, we are just not satisfied with the grouting inconsistencies, (thick in some places, thin in others) not sharp/clean in corners etc.

It is undortunate that unskilled contractors manage to be hired for work they are not qualified to perform. To be fair, the vast majority of tile installations are acceptable or better, but the deficient jobs will get the attention here. We encourage consumers to hire wisely. And while "cost" isn't always the factor, research has shown that there is often a direct correlation between the price charged and the quality of the outcome, so "lowest estimate" should be suspect. This link will take you to an industry publication outlining the questions to ask to find a qualified tile contractor. https://cdn.ymaws.com/www.tile-assn.com/resource/resmgr/pdf_files/Final_13_Qs_Brochure_Handout.pdf

We did expect the tile to look wavy and we're ok with that, we are just not satisfied with the grouting inconsistencies, (thick in some places, thin in others) not sharp/clean in corners etc.

You can't have sharp straight consistent grout lines with wavy, irregular tile. The high contrast between the tile & grout color emphasizes the irregularity of the tile.

The corners, changes of plane, should be caulked, not grouted.

Overall, not that bad of a job. But we know nothing about what is behind the tile & if the install was properly waterproofed.

Who chose the width of the grout joint? That is the main problem here. A slightly wider grout joint, which this style of tile requires, would have resulted in a much better-looking installation as well as gotten rid of the sliver of tile at the top.

As stated above, this type of tile will never have straight, consistent grout joints, nor will it ever have sharp/clean corners. Sorry, but you chose this tile and got what you chose.

I realize the rustic  tile choice is part of the problem, but the shower niche also looks like amateur night to me.

If you know it's waterproofed correctly (which is questionable) and want to save yourself tens of thousands of dollars to redo the whole shower (if the contractor won't redo), I'd get a little tool to scrape out all that grout and regrout with a color close to the tile color. I might leave the dark in the hex and just scrape out the change of planes and caulk that. It won't be the look you were after, but it will look 100% better than it does now. It's a tedious job and you have to be sure to not penetrate any waterproofing that might exist behind the grout, but it's a doable job for DIY. Then be sure whoever regrouts uses calk on all the changes of plane. I think you'll be much happier, at least for a while, and hope that there really is waterproofing and you don't have a moldy mess in a couple of years. Ask your tiler what method of waterproofing he did.

What does the floor look like?

If you plan on leaving the tile, please have the grout removed, and put in white grout. It will look a whole lot better.