The dining plan at DLR is inferior (IMO and many others here) to WDW's because:
a) It doesn't save you as much money
b) You get a set amount of dollar amount vouchers and when you use those vouchers you don't get change. So for example if you want to pay for something that costs $4.95 with a $5 voucher, you will lose 5 cents. That's not a big deal, but if you have run out of $5 vouchers, you need to either pay in cash (which defeats the purpose of a dining plan) or pay with a $10 voucher and lose $5.05 (which can add up significantly)
c) You can't use the vouchers at Downtown Disney restaurants