They're not nearly as bad as you think... Once you get them figured-out.
First: make sure that you've got good water pressure. It takes at least 50 psi to keep the system happy.
Next: only use the hot water faucet. Forget that the cold water one even exists. Use the system controls to set the temperature to a comfortable level. (105 to 110 degrees is a good place to start.)
Once you get the quirks figured out: they do a nice job.