I have to say that with all their poor customer service responsiveness, IT backwardness and problem solving faults (and Europcar bonus points offers hardly ever posting) if I compare apples with apples ie AccorPlus with Star Privilege Pacific and Intercontinental Dining Rewards and its previous iteration Priority Privilege, AccorPlus wins hands down.
With the other two programs you hardly ever were able to get discounts off the lowest publically available rates whereas with AccorPlus the discounts appear automatically when you search the website even off the lowest of low Private Sales rates.
There is certainly good reason why I have done 90 nights in my last AccorPlus Membership year - I can't complain about the actual benefits even if I complain about everything else!