Live tiles that don't work properly shouldn't be the reason to buy the product.
I think WP would sell more with a grid of icons. Specially in the low-end segment, the only segment in which the platform is competitive.
They work perfectly fine. They work perfectly fine of my 930, my wife's 1320, her mom's 630 and her older 625 which I now have as a tinker device, my co-worker's 1020 and they work perfectly fine on my old Lumia 800 which is running 7.8.... They worked perfectly fine on 7.5 too.
If you keep getting load screens and tiles not updating often, it's not the device that's the problem. The problem is with you not knowing how to optimize your background tasks, notifications and apps you leave running in the background which you often forget to turn off.
I'd suspect you're one of those type of people who forget that they have dozens of tabs still active in Internet Explorer or that you have just about every app on your phone having all their background tasks and notifications turned on with vibrate and every bell and whistle sucking up what little resources your budget phone has.
Then you complain that your budget phone and the OS sucks because your battery drains so fast and that everything you do is so slow.
And the previous complaint about tiles flipping so that you don't know what app it is until it flips around again?
Are you that forgetful that you don't remember which apps you installed and which ones you manually positioned on your Start Screen? Or are you that impatient that you can't wait the 5 seconds for the tile to flip back around to remember what app it was?
Solution?
Go into that App's settings and disable all Toast Notifications.
And like the wave of a magical wand, your tiles stop flipping around and remain like those plain, boring, static icons you admire so much from Android and Apple.
Turn off all the extra features, all the toast notifications, all the background tasks.... Make sure you properly close all apps and tabs and suddenly your low budget phone will not only work and look as you wish, but you will also see your battery life last longer and many functions load and run faster.
Less things for the CPU and RAM to do equals a smoother system with quicker reaction time.... Go figure.
Now, if your argument at this point is a deflection along the lines of "well my budget phone shouldn't have to turn all of that off to have a good battery life and run decent without constant loading screens."
My response is this:
You got a budget phone. If you want a phone that can do all the things a mid range or high end phone can do and do just as snappy, then you should have bought a mid/high range phone.
You get what you pay for.