Lost teeth on second ring?
This is a common misconception. The shorter teeth are not chipped or broken off. 

Modern chainrings and cassette sprockets have features to assist the derailleur with moving the chain. The shorter teeth allow the chain to more easily move off the chainring and onto an adjacent one.

Definitely fairly well worn. Personally I'd stay away from something this worn that does not have replaceable chainrings. Given it's possible to get new square taper cranksets for about $30 US, I'd look for something in better shape that will give you more service life.