I have played Firestone many times. It is a great test of golf. It will expose any weakness that you have in your game, while reward you for good shots. For competitive golf, it is a great course. Also, there are many holes that individually are great holes. #3, #8, #13, #16 and #18 are all great golf holes that are both fun and challenging. Always perfectly maintained.
However, I understand why it doesn't get any love on this site. First, it is pure RT Jones. Straight forward, tough par, easy bogey golf. Very little strategic decision making (just looking at the routing can tell you that). Most shots you know what you need to do and the only issue is whether you can hit the shot. I think that is why it is a good pro venue, as the strategic golf that many on this site love (including me) is often not as challenging for the pro tour and is certainly difficult to capture on television.
I enjoy every round that I play on Firestone and believe that it is worth the effort to play if you are in the Akron area. I may enjoy playing Country Club (PP) and Kirtland more, but neither is a better test of my game. As a comparison, it is very similar to Oakland Hills CC. The greens at Oakland Hills CC would be the only noteworthy difference (as they are original Ross designs and more undulating). While this style of design may not be the favorite of me and many others on this site, its still is a fine golf course.