Winrate affect choice?

Hey guys! I've recently changed on boards and people recomend me champs like talon and Kata. I understand why as I roam get lanes fed and have 2 lanes fed etc. But I wanna know is he truly EFFECTIVE. I know everyone is viable but some aren't as effective as others. His winrate is 48 on in gold and silver so is he good low elo? I seem to always find a weakness of a champ and I don't like it. I also get destroyed even Hough I'm fed as X champ and stop playing him or her as I feel champ can't carry so how do I stick to some champs and which ones do I? Phone typing soz
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