Is akali jungle really viable ?
Its a long time since i played it myself in the jgl. But i think u drop pretty low hp on ur first clear which will be a target for invades. Ur ganks pre 6 are non existant which also takes away from ur winrate. I would says as long as u win more than u lose keep playing her. But i dont see her working in high elo.
Im in gold elo so should i let kill early to my team when i gank ?
No u have to carry ur team in gold. Dont rely on them. Esp. not on akali who needs gold to shine.
And what do you think is the best build for akali ?
Gunblade, Lich Bane, Zhonya, Void, Raba. If u feel too squishy get another def item like the new banshee. But u can check lolalytics.com for item winrates on akali.