Borini is terrible but tbh putting him in for a tough game like west ham does no favours especially when the main fault was the midfield behind him getting dominated and outnumbered, there's nothing borini can do about that, you then find yourselves 2-0 down early on, again not his fault but the fault of the midfield and defence. You have Henderson marking a west ham CB ffs. You don't put on Sakho and have Skrtel who's known for his defensive lapses on set pieces...
All I need to say was that Balotelli was pretty ineffective vs West Ham and Villa but isn't getting as much stick as Borini.
As a backup option he's fine, not many teams can boast having Lambert and Borini as backup options, I'd take it over Arsenals backup options anyway. Lambert offers 15 goals when fit, Borini works hard and can give you 5-10 goals off the bench.
Suso is in a position when there's many players who play in his role. Buying Markovic for big money has pretty much ended Suso's career, at least you could have seen a future for him on the wing but he's a bench option when people are injured at the very best with the cup appearances as a starter.