First, the new kid on the block gets blamed for everything that is presented on the screen?
You may have "heard" something, but that doesn't make it true.
Those color problems have nothing to do with PenTile. They are created inside of the cell phone software due to excessive quantization (bit truncation) before the data reaches the PenTile processor. The PenTile processor takes in eight bits operates on the data at eleven bits and puts out eight bits true, with two bits of dither, so that that SPR is in essence outputting ten bit data. This ensures that the color the panel is given is the color the panel puts out.
Did you know that tens of thousands of PenTile OLED panels were in cellphones all over the world, for over a year, before anyone noticed? If you have to be told that they are different before you notice... well... To me, that tells me that they work just fine.
About the resolution. Please read this white paper on how resolution is actually measured and how the PenTile OLED really does meet the VESA Specification (THE one and ONLY industry specification on resolution measurement!):
http://www.nouvoyance.com/files/pdf/CV%20Application%20Note%20Measuring%20Display%20Resolution%20RGB%20L6%2012-17-07.pdf
Those that claim that PenTile is not "true" resolution are confusing the conventional RGB Stripe limitation of six subpixels per vertically oriented black&white line pair as giving a shorthand method of "counting dots" to determine resolution. "Dot Counting" only works for conventional, non-subpixel-rendered, color displays.
The text quality is quite readable, which is the material point. The only real complaint I've heard is that some people have been viewing the PenTile panel up close, some with magnifiers (!) and note that it "looks weird". Well? If one is used to looking at one kind of display, legacy RGB Stripe, with its own set of very distinctive, and quite unnatural artifacts, then look at another, unfamiliar display, with its own set of very distinctive artifacts, then one may leap to the wrong conclusion and say that the new one is "wrong". Neither is "wrong", they are just both different from one another. If viewed from the normal expected viewing distance, the PenTile Panel will present the same image as a legacy RGB Stripe panel to the eye. They will look very similar, though not identical... as I said before, the legacy RGB Stripe is *not* itself perfect, nor should one use it as a reference standard.
Anyone remember what text looked like on CRTs? Anyone remember the complaints that LCD text looked "jaggy" compared to the then "standard" appearance of text on the CRT? The same thing is now happening with PenTile vs. RGB Stripe.