Also Varrok, I don't think Unity is targeted at big devs. I mean shit, from their website:
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THEY MADE IT WITH UNITY. SO CAN YOU
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Yes, there is a reason big devs don't use it though. I guess you have to look at it from the perspective of an indie developer who can't afford to write their own complete tool set from scratch, or license an expensive one. From that perspective it's pretty damn good.
But yeah UE4 is a much better choice, if you know C++.
e: I think the thing that bugs me most is just outright calling an engine good or bad. Different engines are good and bad for different things in different situations. Unity is good for being free and fast to get into, if you have no experience making 3D games.