Of those who have posted they are dead set against a firing pin block, how many have experienced a problem with one? It is so far down the scale on factors to consider for reliability that it is a complete non-issue for me. Yet, I like those without a firing pin block ("Series 70"). Easier to completely strip and easier to get a superior trigger pull. As others have noted, safety is a non-issue with these with a titanium firing pin and heavier firing pin spring.
For me, the presence of a firing pin block will not stop me from buying a 1911 which I otherwise like even if I prefer those without.
Jim's Rules of Carry: 1. Any gun is better than no gun. 2. A gun that is reliable is better than a gun that is not. 3. A hole in the right place is better than a hole in the wrong place. 4. A bigger hole is a better hole.