Li Li is love, Li Li is life.
People say Li Li is the worst support because "all she does is heal", and doesn't provide damage (like Tassadar and Tyrande) or crowd control (like Uther and Brightwing). But she just has SO MUCH healing, especially once you get Kung Fu Hustle, aka The Single Best Talent In The Game, and you're disgorging a Jug of 1,000 Cups every 20 seconds.
Bizz definitely did a great job of making this game more newbie-friendly than LoL or DOTA 2. I was surprised when Valve said DOTA 2 would be identical to DOTA in basically every way, since "streamlining" is usually their big thing; I guess Blizz had to step up to fill that gap. Hopefully it pays off for them.