How much are you typically using and what is it for?
When ordering from a batch plant, I assume you state what kind of mix design or strength, 3000, 4000, 5000 psi etc. You tell them you will be taking test cylinders for compressive strength testing, they'd be fools to send the wrong or defective mix, knowing it will be tested per ASTM criteria.
Sounds like the water/cement ratio was off, and that would definitely ruin any mixes strength.
Small jobs, mixing your own is fine, but you do need to do it uniformly, and if its critical, test your mix design by having it tested, then once proved, use the exact same design, and materials.
Larger jobs, small mixer will not cut it, you can't make enough to keep up, you will have cold joints, where its set up, you do not want structural components built that way.
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