Jeez, for a little less in price, Autocad doesn't even do everything well.
When you find the perfect program that does everything well, PLEASE come back and let us know what it is.
I'll say this about Revit MEP, Autodesk is definitely commited to it's development. There are plenty of large firms using is now with workarounds they have figured out on their own. As was suggested, grab a demo, go through a tutorial or three and see for yourself.
THEN, find a reseller that will help you implement it, not just sell you a box with a subscription.