I am not sure that rack rate on the room (especially a deluxe) is worth the "free" dining plan. You'd need to crunch the numbers on that and do some comparisons.
Typically, for a "standard" family of 4, using a room discount and paying full price for the dining plan will come out better at deluxes. The math behind it is relatively simply, as you simply compare the value of the discount to the cost of the dining plan (including park tickets if you don't need them). Note that this all assumes that you are already planning on getting a dining plan. If unsure, that analysis is completely separate.
For example, the standard discounts are about 25%, 30%, and 40% (value, mod, deluxe). (Warning, numbers and stuff below this line).
A value room during this season will run about $85 per night ($100 on weekend nights), so a typical 1 week stay would run you about $625 on the room. 25% of this is $156.25. QSDP for those 6 nights for one person would run $210. So even a party of 1 is better off with Free Dining at the values. (Though it may take 2 people to make it a better deal if you need to buy the tickets).
Over at a moderate, it comes closer to being equal, at $159/$169. The same trip here (CBR is the example) would end up costing $1133 at rack rate or saving $339.90 with a 30% discount. The DDP for these 6 nights would cost $276. So for a single person here, it's better to go with the 30% off than Free Dining. Once you add a second person though, it changes as the room discount remains the same, but you put another $276 into the savings bucket for the free dining (at least another adult).
Now, onto a deluxe, this may change depending on the actual resort you go to... so let's look at WL and BC
WL, same trip would cost you $250/$260 per night, or $1770. Savings (40%) would be $708. The DDP cost would be the same per person here and doing the math, FD comes out when you go above 2A 2C on the dining plan (FD savings here is 696, for 3A it would be about 858).
Now, onto BC at the $335/$345 price points, trip would be $2365 rack. Discount savings would be $946. Making the room discount better in all situations less than 4 "adults" ($1104).
(edit, used wrong dining plan costs on deluxes... changed the figures a bit.)