A few objections come up again and again. Here are brief, honest responses.
It will never work. No one can promise it will. But the alternative guarantees it will not. See the case for taking the bet.
It is too expensive. Funded through life insurance, it is affordable for many ordinary budgets.
The future will not want us. A civilization advanced enough to revive patients is likely wealthy enough to welcome them; reviving someone is unlikely without a reason to do so.
It is selfish or unnatural. Wanting to keep living, and using medicine to do it, is something we already accept at every other stage of life. Cryonics simply extends that wish past the current limit of medicine.