It is interesting to note that even though IFE is common nowadays I increasingly see people with their ipads (other tablets are available) watching their own choice of entertainment.
I myself am flying on a certain MEB3 airline tomorrow and despite them having a good in flight entertainment system I am armed with a usb full of things to watch of my own choice.
I don't see the lack of IFE as a red line when choosing a flight and suspect many others agree.