The big disadvantage that Greed had was because it was seen as a ripoff of "Who Wants To Be A Millionaire?", the show that really started a trend of huge cash prizes in primetime. This crutch killed the show before it really began. Had it aired before Millionaire, it may have exacted a lot more success.
Otherwise the show had some potential. Five player teams got together with the hopes of earning up to two million dollars among themselves. Because questions had multiple answers (four answers out of six, seven, eight, or nine possible answers, et cetera) teams had to split the responsibility of answering.
However, in later rounds the team faced "The Terminator" which had the potential to challenge players, eliminate them from the game, and take their winnings in the process. It was an interesting format in which you had to have some reliance on your teammates, but could never get too close if you feel the desire to take more of the kitty for yourself.
Plus a great soundtrack which gives you the impression that your heart is beating louder than it ever has before as you edge along a terrifyingly tall cliff with a 70 MPH wind blowing against you.
Chuck Woolery may not have been the most appropriate host for the show, but he certainly did a decent job.
The one thing it couldn't do was survive in the face of other big-prize game shows...