The AMOLED screen is one major reason I can't use it. For all the complaints and endless threads everyone havew about "OMG my iPhone X screen is too warm/cold/green/orange/purple! I CAN'T STAND TO LOOK AT IT!" and yet every fandroid seems to think that off-color, green-cast OLED screen is the best thing ever. The color is so off it actually makes me feel slightly ill if I look at a screen with a lot of "white" on it for too long.
Other than that, 5" is just way too big.
i can't help but laugh at the "Saumsung didn't innovate/there's no wow" type commentary though. So Samsung is now getting hit by the same fanboy-fatigue that Apple is, where they psych themselves up with unfounded rumors and get disappointed when Samsung doesn't "bring it" (whatever that means).
There was even some fool who was bellyaching that the US version of the GS4 "only" gets a quad-core processor, while the international version gets an 8-core. Really?? 8 cores on a smartphone?! I still have yet to max out the 8 cores on my old Mac pros! Exactly what are we expecting to do on a battery-powered device, which will be on a capped cellular data network most of the time, that can be done so much better on 8 cores that just can't be done on 4, or 2?
This isn't Prozac or some mood-altering drug, people. It's just a hunk of metal and glass (or plastic and glass) that sits in your hand and does computerish-things. There are realistic limits to the "magic" and it's time to acknolwedge that.
From here on out, it's evolution, not revolution.
And if you are truly counting on consumer electronics vendors to give you your endorphin rush, from here on out, you WILL be disappointed. I would strongly suggest you make an appointment with your local psychiatrist, who can replace your dependency on product unveilings with a dependency on mood-altering prescription drugs. The effects should be more consistent.
The rest of us in realityland will continue to evaluate our smartphones and tablets based on practical workflows, and what works for us, consistently.
(tl;dr: The Galaxy S4 is a fine phone, but nothing so groundbreaking that it would overcome the things I don't like about Samsung smartphones, and definitely not enough to make me disrupt my life and switch ecosystems.)