Voltage feedback op amps are used in a wide variety of applications and are available in more varieties than current feedback. The perfect op amp would have an infinitely high input impedance which would ensure the op amp did not load the source (Vin), as well as having zero output impedance so it could drive any kind of load. It would also have infinite bandwidth and infinite open loop gain. Open loop gain is the total op amp gain with no feedback. Lastly, it would have no DC errors of any kind. Of course, there is no such thing as an ideal op amp.