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I've had mine for a few months and that's all true.
It's specced well, but is a mediocre performer at best, and a right PITFA at worst. Pretty nice build quality, and for the money not bad - just very hard to love (for me anyway). The advertised Android 4.3 upgrade swayed me, but even that hasn't happened.
Really wish I'd looked more at the Nexus 5/LG Optimus before buying. I think the Samsung Super AMOLED display is way nicer too.
Xperia ZR is superior in processing power,better display,more RAM.The GPU is the same.ZR should do better in games than SP.
Also keep in mind that not all games are compatible, even if your phone its capable of, there are some country/regional restrictions, and/or bugs have to be addressed by the game developer not Sony.