Rengar needs a buff i think

I think that rengar needs a buff or I just suck with him , I have a feeling I do but in this game I played today it was quite funny ashe got a penta kill and I ended kill a double kill while I was dead so over all It was a victory so the fact that I tried rengar out as a jungler which was hard enough as is because I was facing another rengar jungler with the same summoner spells. I either need to get better with rengar or start playing different champions as requested im going to start playing in order of champions and write about each one.