I think Hatton's body and chin just don't sit well at 147...
If the ref or fight style allowes him to fight his fight, and do the most damage that he can inside, then I believe he does have the power to trouble a lot of the 147's out there...
But to get off all the effective shots he needs to bring down some of the better guys at 147, he's going to get hit with a lot of very hard punches...
I don't think his chin stands up to that very well.. He's a tough guy and realises it's "not a tickling contest", but getting tagged with to many hard punches makes him abandon his game plan a little (as it would do with most fighters)... He gets more weary of coming in, and isn't as effective at bullying and overpower the bigger opponents at 147..

He is certainly not a bad fighter, and has done very well against some very good fighters in my opinion... I take nothing away from him..

But basically, I think he's just missing 2 or 3 assets to really succeed at 147 (which is lets face it, one of the most competitive divisions right now).

1. Chin that he would need to be able to withstand the punches he needs withstand in order to get his own work done.
2. Defence to actually avoid all those punches and still get his own work done and overwhelm opponents.
3. The true power to really end a fight early with opponents at 147 ..

If he of been at 147 for more of his career, had kept his speed and maybe taken advantage of a little more power that comes with moving up weight.. And perhaps a little more defence while getting in close to fighters,,, I think he could have succeeded a lot more....

Overall though, for his attributes he got the most out of himself and his career and I have huge respect for that...