I have concerns to. Stop the installer and ask for a real wood flooring professional to come in and have a look. There are several issues I can see - the nails being the LEAST of my concerns.

Where did you source the wood? Is it MEANT to be face nailed? Or is it tongue and groove? And where did you find the installer? Is s/he a flooring PROFESSIONAL or "Chuck in a Truck" type of 'handy person'?

Floor registers go in LAST BTW.

Thanks for your response!

This was done by a flooring professional that came highly recommended by both our architect and our contractor.

They assure me it will look flawless once completed, but I just can't see past the imperfections now. They say in tight areas (mostly corners) where the nailer can't be used at an angle it is normal to face nail the boards.

On one hand I could trust them that when all Ali's said and done, it will look great. But on the other hand, a lot of time is lost if It doesn't look great if we have to have them correct it.

Both our contractor and architect are telling me to just "chill out" and trust that it will look great once finished. I'm finding that hard to do.

Milling on site finished isn't perfect. I do see a bit of a sloppy install but if your pro is good he should be able to make it look good. Btw gc' and architects rarely know 'the best pros' cause that cuts into their profits I'm afraid. Real craftsmen work directly for the homeowner imo.

You appear to only have face nailing along the edge where it's unavoidable. The minor gaps at joints is common and all will be filled prior to finish. The only thing that looks sloppy to me is the wonky board by the register...