New Player Difficulty Concerns

So I've been reading around that things started off too easy and are now more challenging which is excellent, but everyone seems focused on Kara.

How difficult are the heroics? My favorite part of a new server is doing quests and heroics to build up gear for kara. Are heroics neglected when it comes to tuning? Is Kara so easy that you can skip heroics entirely (ignoring badges for arguments sake). I really wanna play here and bring my guild but we were blue balled by gumball and we want a good alternative.

Thanks!

Kara is essentially not possible for anyone that didn't waltz through it while it was in it's initial state. Though even those tanks that have all the available tanking gear and items are getting 1 shot by trash.

Karazhan has been fixed. :)