I flew with MYT Lite to Malaga in October just after they launched, and I would probably have to say it was just a one off bad experience, but I did not enjoy the flight at all.
I just found the staff to be very rude and unhelpful, they sent our bag back to BHX rather than off-loading it in AGP (we saw it go on the plane but not off and the EuroHandling Agent did tell us the truth) and I just found the overall service pale to that of EasyJet, Go and buzz.