I like the ones who are not overrated, but have good content ,worth watching and they actually talk back to their subscribers. I don't go by popularity. For me, it's all about content and what type of knowledge and videos you are providing for your viewers. For me thats what makes a good Youtuber.
My top three favorites:
MisspTV
A Youtube partner. She is awesome! Her videos are very creative. She talks about basically everything. I recently followed on twitter. She also likes to help people and inspire them. I love people like that.
Lovelyt2002
Another Youtube partner. I've been watching her videos since 2009. We are really close.She has given shout outs in her videos, we are Facebook/Twitter friends and I use to blog for her site. She talks about various topics. She is not a cookie cutter Youtuber, she says what's on her mind and she doesn't give a ****. That is what I like about her.
Digitalsoul
He is my favorite male Youtuber.I have been a long time subscriber of his. He talks about videos games.
Honorable Mentions: NancyDrew37, muchlovefromky, ThisismackTV, JennaMarbles, and CerebralMadness
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