They were aware that the limbos are there, they went to save Sakura, it's show by Sasuke's panel and Naruto telling Sakura to wait.
Madara got new powers and they werent supposed from a battle perspective to attack first, because you dont attack an opponent that you dont know what kind of new abilities he has on his sleeve now, the best plan was to wait and counter-attack.
That's how shounend works.
False, from a tactical stand point whether in fiction or non fiction sometimes the absolute best course of action is to attack BEFORE you are attacked. If you wait until you are being attacked you might never get a strike in against your opponent. If you at least go first you have a chance of causing some damage before you get taken out.
What Sakura did was actually pretty wise, she plays the defense/Distraction by being the meat shield (since she can't really die...) and Naruto and Sasuke go the offensive route since they are stronger. Its a common tactic in games when you think about. You've got the merc, and two high damage players beating the crap out of the monster whose to busy gnawing at the meat shield.
The only problem is that they have no idea what the limits and abilities of the limbo really are. ( especially not Sakura.) That and their teamwork absolutely sucks thanks to Sasuke wanking it up.
On another note...Seriously, There are some things Kishi does really well and then there are other things he utterly fails at- like writing ACTUAL best friend relationships.
Shino's a better friend then Sasuke to Naruto, and if we all want to be brutally honest- Sakura is the closest friend he's got. Sasuke has not been Naruto's friend since he tried to kill him in the VoE, all his is now is a rival. The only reason Sasuke's working with Naruto is because he NEEDS him. If it weren't for that, he'd have let Naruto fall into trance just like everyone else.
Every time I hear someone call Sasuke Naruto's "friend" I cringe. In my opinion if these were real life people Naruto and Sakura would be seeing a psychiatrist for their Sasuke obsession 'cause that crap is not healthy.