Landing page relevance. It looks great, but its not obviously relevant.
If one of the keywords you are bidding on is: lawn care bids, for example, then you should display that phrase somewhere in the middle of the site, instead of :
"Companies want your business
Let them compete for it "
Say: "Get cheap lawn care bids. Complete your landscaping for less! Post a job now to get the lowest priced bids in town from professionals."