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With Epic developing two games with UE at the moment, we can hardly say the engine is untested
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The best way to test an engine is to create a game using it.
Guys you really think that paying 10 bucks for engine will make it more stable? 
10 years ago engines cost kkk bucks and they werenāt clear from issues. It was far away from what we are seeing Today. Today you have engine that cost kkk 10 years ago for free with source. And you are complaining. Thatās frustrating and thatās why I have started my dev blog - seeing those comments, seeing people donāt know how to create games as they HAVE EVERYTHING right in their hands is making my cry. Really? You have everything and still are blaming. You are just lazy. Take your time and learn how to create games because maybe those āblocking game issuesā are caused by you.
Check my blog - there was issues which as you may tell āblocking game developmentā but there is always different way. Take your time, learn stuff. You wonāt be game developer watching or programming couple of days. It take YEARS. Iām years in game dev and still Iām learning a lot. I can tell that Iām newbie even after those years.
UE4 is trying to get to place where every type of game can be created without c++ skills. They have long way ahead but you choose engine for game that you are trying to do.