It depends on what you're trying to control, the type of grass you have and how widespread the weeds are. Tenacity isnt meant to be used as a single mode of action.

 

@chip If Tenacity did not do much for you, I think app practices should be revised as well as expectations. There is NO a 'perfect' herbicide. If I had to pick up it would be by order to importance:
1. the trio 2,4D Dicamba Mecocrop. Boradleafs
2. Quinclorac. Crabgrass
3. Tenacity. Almost everything but slower
4. Triclopyr ester woody weeds like clover
5. Sedge hammer

With this you can knock any weed in cool season grass than is controllable

 

I like @Babameca's list but for my yard would prioritize it thusly:

1. A 3-way with 2,4-D (amine salt) for most broadleaves during most of the growing season.
2. Triclopyr ester (w/ or w/o 2,4-D ester in the same bottle) for early spring use and for killing stuff that doesn't respond as well to #1.
3. Sedgehammer (halosulfuron) and/or sulfentrazone, if you have nutsedge or kyllinga. Use one AI one year, then alternate with the other AI the following year if the sedges come back.

I don't use Tenacity for spot spraying non-grassy weeds. Yes it will work on a variety of weeds, but it's slower to act and the above three products will usually do the job without bleaching my good grass.

Spring pre-emergent will get the crabgrass issue almost totally licked within a year or two. Last year I had about a dozen of them show up around August, which I hand-pulled. I no longer keep quinclorac in my arsenal.