people, saurus were never ment to take out elite infantry, black guard or greatswords or grave guard or etc. rapedd them in 7th and do so now aswell, the advantage they have is that they can still dish out 20 attacks per round of CC and as long as you got 3 ranks after the opponent strikes you're ok.
they were awsome in 7th when models were killed from the front rank, they didn't get any worse now, they stayed the same.
indeed the bonus is only 5 attacks now instead of 10 but with the price of saurus and their huge I they need all the help they can get to even hope of defeating a horde, and with some luck they can even kill elite units if they are large enough (6x5; 5x6; 7x7) to survive the initial attacks, lets not forget that despite their awesome CC abilities, elite infantry is based on 7th rules where they charge, take out the front rank, and win the combat without taking casualties, this is not the case any more. Black Guard are WS 5 T3. thats 4+, 3+ for our saurus and they get a save of 6+ vs us. ofcourse we die but the days of a black guard unit raping half the army and then leaving for home with minimal casualties are over.
on the other hand, our steg's got weaker aswell since their impact hits and attacks don't remove models from the front rank maning that a unit has a fai chance of getting some CR by killing the skinks on top so overall i think saurus actually got better because of their ability to take some punishment and still dish a lot of attacks at S4.
i advise you still buy those spears that are basically free, ofcourse you can't chose what to use now but i'd rather have the spears