As a fan of TNA, I don't like it because he hasn't completed his "road to redemption" for me. It was a really big fall when it happened (my opinion). I do feel that he is on the right track, since TNA has pretty much kept him away from the WHC since and left him in mid-card battles, but I still think that the he shouldn't have gotten this title for a few reasons.
(1) If they would have delayed his title win to Genesis, it would have given Aries a decent run for the TNA fans as well as make a point that until we know we will have you for another 3 years, we're not going to build put the companies top title in your hands if we don't know where you'll be. We learned this with Kenny King / All Night Xpress and unless TNA has secured the ink on the paper and the news hasn't been released yet, they should have known better.
(2) This could have been the next year long story. If they wouldn't have let Hardy have the belt, they could have focused more on Hardys full "road to redemption" by having him win it at next years Slammiversary or even BFG by becoming a two time winner of the BFG series. It would have been an emotional sale in that it meant so much to prove to his fans that he is back to where he was before he fell from grace. Having just pushed this "road to redemption" aspect since the OFN Impact, it really had no time to become cemented or register the emotional value that it could have had with not only Hardy fans, but fans of TNA who have been watching him since the mid 2000s struggle and bounce back and forth. It would have sold me, and the general wrestling fan who knows of his problems, that he is truly back to what he once was.
(3) Aries only solid notch in his reign was beating Roode once clean to win the belt. If he was good enough for to take the belt off Roode (who no one could beat for the belt), then how is he going to lose it to Hardy on his "first defense"? (I don't count Roodes rematch, because that was entitled to him... And I don't count the "Armbreaker" match because that was just... Well, you know) You basically just made the one guy who FINALLY beat your dominant champion a "transitional" champ; I don't agree with that.
It's just my opinion, but that's what I think.