Sid is great in almost any team. To get the most out of his crit buff you can pair him with any heroes that are reliant on crit. (Extra effect on crit) he also is great paired with abilities that hit harder with negative effects on the target.
Since you just got him I will let you know a tip I enjoy, when he keeps an opponent from healing who is at low health, all the healers will still use up their healing even though it's a waste. Great advantage!
Me too, had enough spare gear/energy to get him to 4.5 gear. Immediately helped me clear a DS mission I was stuck on, and in epic fashion he landed the killing stroke on Kit Fisto xD
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I use Sid with JC, Lumi, Dooku and Ahsoka