Well; you could use that engine to produce something well-written, deep and interesting like New Vegas, but that still got dinged for being an absurdly bug-ridden release with serious performance issues. It was great despite the engine, not because.
There's some slightly-shonky open world engines that support some really impressive RPGs (eg. Baldur's Gate 3 on the Divinity engine - looks great but performance is arseholes) and some very impressive open-world engines that support some lightweight RPGs (eg. Horizon Forbidden West on the Decima engine - looks great and smooth as butter). And then you've got the Creation engine, which looks terrible and has terrible performance, and which runs bugs and glitches in a way that combines into (usually) very shallow RPGs.
kenshi is also an awesome game on an old engine. Very excited for the sequel using unreal engine that's coming out in probably 10 years because the indie devs want to release a finished product