I only have one problem with inexpensive rotor cutting and I'm not indicting every place that cuts them cheaply.
Many places want to whip them out quickly so they set the cut to the fastest position and take off a lot of metal on each pass.
No more metal should be removed than necessary and this means .004 (roughly) at a time and with the chatterband in place on the rotor.
The final cut should be light with the lathe set on the slowest speed and with the chatterband in place. This will produce a smooth, proper finish. Some places skip the slow cut, skip the chatterband, and unless the customer knows better they may assume that finish is what it ought to be when it's really not.
If you go with new rotors you should always, always clean them with carburetor or brake cleaner before installing them. Many rotors have a rust preventative film on them and this should be removed. Sometimes this film is very noticeable (may resemble Cosomoline) and others may not be visible at all. Hope some of that helps.