Fed is pretty good with the serve and volley play, but if you had to pick on one area, I guess that could be the area he could improve.
Aceit - I am not sure it would be boring, to me at least. I guess you could look at it two ways. One, he would be making history and that is always fun to watch. He is so much fun to watch and he is so good that he draws attention.
On the other hand it does keep others from winning slams and tournaments and everyone never seems to have a chance against Fed. But this year the women's game couldn't have been more boring for me, and they had 4 different slam winners.
I think in the end I would rather see Fed rack up a lot more tournaments, he has so much skill it would be sweet to see him compete for a super high number of slams. He has a lot of work to do though.