Does a bad job with image sizes

For the portfolio pages, I uploaded very large images and specified they be used full size. The images are shown at the full size dimensions, but they are not the original, full-size files, so they’re blurry and look just awful. Example: uploaded image is 1080 x 1920, and is displayed at that size, but the source image “natural size” is 768 x 1365 (the size of “large” images, not “full” images). Even worse, an image uploaded at 1920 x 1080 displays at 768 x 432, (again, it’s the “large” image size generated during upload) in this case meaning it’s stretched out to almost triple its original resolution.

Considering the high resolutions of modern “retina” or ultra-HD screens, this results in things looking absolutely horrible. If you’re going to force image size, force the dimensions to match.

I have tried this with two different themes including WordPress’s own Twenty Seventeen, so it isn’t the theme forcing the image size. When I put a full size image into a regular post, the theme displays it properly; most modern themes do a great job of letting you put in a full size image and showing the right size to the right screen resolution — but these portfolio pages do not follow the theme’s content width, allowing the images to be stretched to the full width of the browser window. I saw in their forums that someone else made a note of the portfolio pages not matching the site’s content width, to which the plugin authors responded that it must be a non-standard theme, however I am fairly certain this would not apply to WordPress themes made by WordPress itself.

As a side note, in replies to other concerns in the comments section of their website, the authors encouraged users to edit the plugin’s PHP files directly. I’ve never seen a plugin author recommend such a thing, in fact most make a strong recommendation against it because updates overwrite the whole plugin and erase any changes made. Seems like pretty terrible advice (unless they actively plan never to update).

Also, an author rating their own plugin 5 stars? I’m torn between 2 and 3, but part of me wants to put 1 just to balance out the obvious bias of someone reviewing their own work.