Stuck in this house until lease ends?!?

We're renting a house in california. We've been here for a miserable 1 & 1/2 yrs. We signed a 3 yr lease because we were told this house was easily repairable & a great deal for the area. As first time renters we were too quick to believe this (our own fault & a big lesson learned). On our rental agreement it says we accept the house "as-is". For 3 mths we paid half rent (full rent is $500) as agreed to cover costs to fix the ceiling in one bedroom(needed to be totally replaced), paint all the rooms, new carpet/flooring in 4 rooms, and buy a fridge .After all was said & done it came out costing much more than the $750. We've had electric problems (Heck, the bathroom & dining room don't even have outlets), plumbing problems, foundation problems, etc. We've tried fixing it ourselves to no avail, these problems call for expertise we don't possess nor can afford. Now, since the lease states we accept it "as-is", our landlord refuses to pay for anything. Am I stuck in this house for another 1 &1/2 yrs? Is there anything I can do or am I SOL?! I have 2 young children & I'm honestly afraid for their safety in this house.

Thank you for any help/info!