"I want my free game material to have pictures and look like a paid-for product."
I think this isn't as ridiculous as you're suggesting, because with 4E, that was how articles looked, for the most part. The same with print-based Dungeon/Dragons, too. So it's not like it's some sort of wild and crazy "IM SO ENTITLED!" demand. It's more like, there was an expectation of how these things looked, and that expectation was not met.
It's also particularly odd because it seems like WotC have a massive back-catalog of Eberron images, so surely could have used those, even without commissioning new art? Does that cost them anything beyond time for the layout guy? I honestly don't know. I suppose it depends on the terms they negotiated with the artists when the art was originally commissioned.
That said, I also liked the article. It's a good first "moar rules" article for 5E in two regards:
1) The rules fit well with the existing 5E rules-style. There's nothing here that feels "at odds" with how 5E does things. This is not something that was true of some early 4E and 3E stuff (though we shall see if future UA articles are as on-point).
2) The rules seem, well, largely good. One can certainly say "I wouldn't have done it that way...", but I don't think there's anything that stood out as obviously bad/stupid/lazy.
So I think it's reasonable to query the lack of art, but I also think it's a pretty good start. Hopefully future rules are at least as solid as this (the only one I'd instinctively want to change would be the L14 Artificer one, as I think "a month of rest" is hella dull, and I'd prefer that to just be a month in which that ability cannot be used).