Ricky Hatton -
Possesses decent jab but never uses it
Not effective at all throwing effective straight punches
Relies too heavily on hooks (punching bag syndrome)
Conditioning is still great but lately has been tiring a bit in the late rounds of fights
Cuts and bruises fairly easily
Short arms make Ricky completely reliant on inside work
Very quick with feet, body, and head/shoulders but still a very defensively flawed fighter
Lunges in with punches (against most fighters he can get away with this and actually uses it too his advantage, against Mayweather he will have to find another way in)
Not a big puncher

Floyd Mayweather -
Low work rate at times can negatively affect judge's scoring of round
Allows himself to be bullied on the ropes a little too much at times
Not a big puncher

Floyd, honestly, is one of the most unflawed fighters I've ever seen. He almost literally has no holes in his game. Hatton's a good fighter but I really think that he'll be confused on how to score for the entire fight.