I would tend to agree with your list, although I wouldn't say Federer's known for a bad backhand. During his prime, it was excellent except vs. Nadal on clay. Now, it is still excellent when he's playing well, just it isn't as consistent.
Re return of serve, right now I'd say Murray; but if you're comparing primes, I'd say it's much closer and more difficult to tell. Mainly since Murray is such a passive player.
Sufficed to say, if Murray was really better than Federer in every aspect of the game except the forehand, he'd have multiple slams by now.
I also think Murray is particularly weak mentally and strategically.
I didnt mean fed's backhand being a weak shot..but weaker of the 2.."lesser of 2 evils" (forehand vs backhand) while murray is the opposite. Fed's also vulnerable in his backhand side somedays..especially now days..(i gotta agree with you though, during feds prime..his backhand dtl during 2006..especially against blake in a masters i think..amazing).Return of serve, fed has his moments but i see murray as an overall better returner because he can return the ball deep more often and doesn't tend to miss or chip as often as fed..especially this year.
Mentally fed would be stronger because of his match experiences in highly pressured situations (basically he's been more pressured then andy ever has since he became a consideration for GOAT).
Stragetically..im not sure..murray is known for his strategy and game plans..while federer does have good game plans too..i think i might give this to Andy.