Large thumbnails int he grid mode in Lightroom Mobile on iPad are pixelated. If you force LR Mobile to download the images to the device when it is in small thumbnail view mode, the thumbnails are fine, then if you change the view to large thumbnails, they look awful and very soft and pixelated. So much so that you can't see faces and smiles or eyes. It's embarasingly bad! This is clearly a Bug. The system should build thumbnails that are clear and beautiful for the largest possible thumbnail no matter what.
The full photos when you tap on them are fine. So there is nothing wrong with the photos. The system is just making really bad thumbnails.