Had a credit account, never missed a payment, always cleared quickly and then suddenly 'temporarily' restricted for no apparent reason (it's been a few months now and still in place). I'd paid for a years worth of unlimited delivery on the basis that the service would continue to be frictionless, won't be doing that again. Good job I'd cleared my entire balance ahead of this mystery restriction.
On top of that, the website now seems to be falling apart at the seams, errors when trying to access the account area, search not returning results despite accurate keywords, poor interface, especially on mobile. Weeks long delays on 'in stock' items I'd shut down my account if I didn't have to call them.
I'd rate them as 0 out of 5 if it were possible.