Is the iPhone 4 16gb still a good phone?

I was wondering if I should buy a new phone like the Moto G or something like that instead of an iPhone 4 my brother has laying around. It's a few years old so is it laggy now and unusable for Wi-Fi internet browsing and gaming?

(Currently own a HTC Thunderbolt)

Iphone is a iphone can't go wrong

Get the MOTO G the iPhone 4 won't be getting anymore updates and it will be pretty laggy and slow

The iPhone 4 is very capable of browsing the internet/gaming still.

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