(Technically 4.5 but that's not an option) Ordered twice from Wow Sushi (off Just Eat) and both times have been great. Delivery is prompt and the sushi is fantastic.
The Japango, Young, and Louis Rolls are worth a try (especially the Japango with the awesome sauce). The salmon sashimi was just ok. It was a bit pricy and didn't really "wow" me so in the future, I'd probably just stick to trying out new rolls and re-ordering my favourites.
Overall, Wow Sushi offers a lot of variety and the prices - for the most part - are fair. It's worth a try!