I hate to break it to you… but…
Steven Moffat did not ruin Doctor Who.
Russell T Davies did not ruin Doctor Who.
John Nathan Turner did not ruin Doctor Who.
Rick Berman did not ruin Star Trek.
JJ Abrams did not ruin Star Trek.
Michael Bay did not ruin Transformers.
Michael Bay will not ruin TMNT.
George Lucas did not ruin Star Wars.
JJ Abrams will not ruin Star Wars.
Joel Shumacher did not ruin Batman.
Brett Ratner did not ruin X-Men.
David Yates did not ruin Harry Potter.
They took new approaches to the material which you, personally, do not like. Plenty of other people do (yes, that even applies to JNT and George Lucas).
Your opinion is not the be all and end all, nor is it a statement of fact.
Should you ever rise to a position where you are in charge of these great franchises, you will undoubtedly put your own spin on it, and there will be those who claim you too have ruined the franchise.
They will be as wrong as you are now.
In the meantime, here is a little light reading for you to enjoy:
Go in peace!