Honestly even in combat Sai has been a complete utter disappointment and failure. I honestly don't think he's had any major/badass victories or fights in the entire manga. Most other ninjas seem able to dispose of his ink beasts with no effort what-so-ever. I'd say his introduction was one of the biggest missteps in the entire series.

God I hope he gets killed by sasori. I also hope sasori does something a little more exciting then just controlling live people. I mean didn't he have something like 300 plus human puppets? Would like it better if he pulled one of those out.