Is the asrock z87 extreme4 a good mobo?

Hard to answer the question without any idea as to what tasks it will be asked to perform ?

Overclocking ?
How Many GFX cards ?
Gaming, general use or Workstation ?

In the $125 - $200 price range for gaming rigs, I have to agree with the majority of reviewers and go with the MSI G45 (winner of over 40 awards) and the MSI GD-65 ...... The Asus Hero is pretty much on par with the GD-65 but the GD65 is $52 cheaper ...... more than $90 if ya get it in a combo.

$148 MSI GD-65 http://www.newegg.com/Product/Product.aspx?Item=N82E16813130692

Get an extra $43 off in this combo with an Intel 4670k and heavily overclocked GTX 770
http://www.newegg.com/Product/ComboDealDetails.aspx?ItemList=Combo.1461080