Townsend - better than Borini imo.
Wijnaldum - hit and miss but he's streets ahead of any of our central players going forward. In a midfield three with MVila and Kirchhoff, I'd choose him over Catts every day of the week.
Shelvey - see Wijnaldum but to a lesser extent. Still better than Catts going forward, but I'd hope we would sign someone better than both in the summer. Not bad as a benchwarmer though.
Perez - wouldn't be a first teamer for me straight away but I think he has potential to be very decent. Also, as of summer our only out-and-out striker will be Defoe, who's getting on a bit and likely won't be able to play 90 mins week-in-week-out for the whole season. I'd envisage Perez slowly being brought into the team in his place.
Mitrovic - again probably wouldn't start him ahead of Defoe at first but he is very young and could be a real weapon once he's had time to adapt to the league. He also offers something a bit different to Defoe and is miles ahead of N'Doye imo.
Janmaat - Way better than Jones who will officially be our first choice RB come summer

. Very good going forward, but questionable at the back. I'd like to think Big Sam could sort that out and make him a decent all-rounder.
Aarons - again, I'd have him for potential, not a first-team player straight away. Looks like he could be very decent in a couple of years though.