Leatherhead
Possibly a Idiot.
I think the real problem with Paragon multiclassing is not the Powers; they actually seem equivalent. The issue is the loss of PP features, particularly the action point use bonus. I think if something like this were added back in, the option would be about on par.
One of the things that irks me about Paragon multiclassing the the lack of class features, mostly base class features. When you paragon multiclass, you are no longer a dabbler, you are devoted to that class. "I am now a formally trained wizard with a degree in wizarding, even thought I graduated from fighter school ages ago. What do you mean I can't cast mage hand?"
The other thing that irks me is when you can take one of the second classes Paragon Paths with a lesser number of feats, get most of the goodies of multiclassing, all of the goodies of a paragon path, improved synergy, and all of the flavor of a generic Paragon Multiclass. It is a rather large discrepancy.