While I know its a very limited glimpse, it seemed telling that the only real clips of Sambi in the All or Nothing show was him complaining to Eddie about playing time. Eddie didn't seem to have any patience for it either so I'd guess it wasn't the first time he'd said something like that and with the amount of hard workers we have on the team in addition to the no-nonsense style of Arteta, it's not hard to imagine that players with that type of attitude get pushed to the periphery pretty quickly.
Personally, I have always felt like he was just very ordinary- no real standout qualities that would allow him to excel at any of the midfield positions. Hopefully we can just recoup a decent portion of his fee and move on.