You pay a premium for renting a car at the airport in terms of taxes/fees, which still have to pay with a points rental - some airports are worse than others about this (I’m looking at you, PHX), but they still add up at MCO. Additionally, you often pay a premium in terms of the points per day cost, and this can be really bad at MCO. However, if you look at nearby outlets for the same company, you can bypass these extra costs.
For example, for the trip I’m planning I can rent an Intermediate vehicle from Avis for a base rate of $138.75 with taxes/fees of $64.63 for a total of $203.38. If I burn 7,000 points I can get two free days, lowering it to a base rate of $92.51 with the same taxes/fees for a total of $157.14. Big whoop - I can probably do better with @JackOfAll’s tips and not have to burn the points.
However, if I rent from Avis’ Landstreet Road location (9 miles from the airport, and on the way to WDW), I can get an Intermediate vehicle from for the same base rate of $138.75 with taxes/fees of $23.98 for a total of $162.73. If I burn only 3,500 points I can get all the days free, paying just the taxes/fees.
In summary, by switching to an off-airport location, I save $133.16 and 3,500 points, which more than covers the cost of an Uber to the location (which I estimate at $20 each way, tops). Additionally, I skip the hell that is MCO car rental. Plus, for an additional $5.45 (total) I can upgrade to a Premium vehicle - I didn’t even bother to figure out the $/points cost for that at MCO, as it would be horrible.