To be fair, the iPad 3 was the worst value iOS device since the lineup launched:
-Less GPU power per pixel than iPad 2 (or Mini)
-Less CPU power per pixel than iPad 2 (by almost half)
-Had to go backwards in size to accommodate battery
-Was the only iOS device to be replaced in 10 months and then was COMPLETELY taken off the market, while the iPad 2 is still sold
The writing has been on the wall for a while that basically every iPad 3 owner got screwed on a half-baked device that was rushed out so Apple could say they had a retina iPad. We all knew back when it launched there was a chance it would have a SHORTER life than the iPad 2 due to the setbacks Apple had to bundle with the product to get it to market in time.
So you didn't get screwed today when you upgraded iOS, you got screwed back when you bought the iPad 3 or you kept it once it was obvious it was a nasty bandaid in the iPad lineup.
Well... All of that is true about the iPad 3, but it was the first to have the retina display, and to this day its display is gorgeous. It's a compromise.
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The iPad 3's life was cut short by the iPad 4. Had Apple not moved to a new connector (lightning) and wanted to unify their product line, the iPad 3 may very well have had a much longer life than it did.
If anything, the trend points to all iPads having a very short life. They all don't have enough RAM (planned obsolescence). Unfortunately, that trend looks to continue.
-The first one was crippled due to the 256MB of RAM. The single core ARM Cortex A8 is pretty terrible and laggy by today's standards too. Forget iOS 7, the iPad 1 can't even run iOS 6 (!!!!!!!!!).
-The second one is probably the longest lived and most balanced designed iPad to date. So much so that they basically re-used its guts in the iPad mini.
-The third gen had the beautiful retina display but A5X was essentially a doubling of power for a quadrupling in # of pixels. It was replaced in 10 months.
-The 4th gen has the much more powerful A6X with a much better CPU and GPU but still has 1GB of RAM, which is an issue. I get so many crashes with Chrome and multiple tabs open. Safari is more stable but it was garbage before iOS 7. Hideous interface, and not even a unified search and address bar!
Plus the iPad 4 clearly needs to purge apps out of RAM like crazy due to its memory. The Nexus 7 is better for quickly switching between a huge # of apps due to having twice as much memory.
-The iPad mini was released with dated hardware and it isn't aging particularly well with the inferior display and puny 512MB of RAM.
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I realllly hope that the new iPad 5 and rumored Retina iPad mini have 2GB of RAM. Apple needs to stop cutting corners on memory!