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.