What a good virus

Why is it that there are dozens of anti spyware and stuff out there but you can never get a good one to work!!! SpyZilla, SpyZooka, CounterSpy, SpyKiller, Spy Bots Are Us (ok I added that) to name a few. There are so many and when you go to research them these PC magazines that are (sic) unbiased offer up an anti spyware company then come to find out they are somehow tied in with each other, very similar as Consumer Reports unbiasedly recommends a product as a best buy (yeah right...). Honestly, is it really that hard