I would imagine any good quality, well fitted aftermarket systems would likely perform better than the original system. All this type of tech dates incredibly quickly.

Although I do think that there is something nicer if it's all factory (even if less capable than more modern systems). So I'm happy with what I have (even if it is limited/slightly dated).

Best you can hope for from the factory system is to feed something in via the AV sockets, as already been mentioned above. It will never be HD, so there is merit in hanging mini iPads there or something, but then it’s obviously not integrated.....

 2011 Range Rover Vogue SE 4.4 TDV8

Previous cars :
2003 Range Rover Vogue TD6
1999 Discovery Td5 ES
1995 BMW M5 3.8 6 speed
1992 Range Rover 3.9 Efi Vogue
1992 BMW M5 3.8
1988 BMW 735i SE
1989 Ford Sierra XR4x4 2.9i
1981 Ford Fiesta Supersport

If there was a way to replace the dvd changer with chromecast for front and rear it would probably get used a lot more.