Got to agree with the guys on a router here.
It is WAY quicker and easier, for me, as my shop is small, steering 4x8 over a table saw, unless you have a big one with large wings and a good infeed and out feed table will be work, and you will be hard pressed to get straight accurate cuts of all the same depth.
now if you make up a simple dado jig for the router, you use a router bit that is say 1/2", then you take a piece of the wood that you want to make the dado for, and set the jig up for that piece, you then do a push-pull with the router, two small cuts are easier on you, and the router bit, as well as making the dado the exact size of the wood you want to put into it, if that makes sense. You then rip the sheets into the pieces you need and there you go.
I did a whole bunch of dados on some
wine shelves I made......
because my shop is small, I ripped the pieces down to size first, then I did the dados, if you follow that link above, you will see a bunch of pics of my method and the jig I slapped together.
Cheers!
YMMV