The front venting on mine is crap as well and, the final icing on the cake is that it wasn't very breathable when I used it for the 1st time in sustained rain a couple of weekends ago.
They use the same membrane type materials as most other cycling jacket manufacturers, I can't see how it would be any less, or more, breathable. There's more than one SP jacket though, so maybe your dissatisfaction doesn't apply across the range.
I like mine, mainly for the venting, but you can't please everyone
Don't like the back pockets though, those that have them, so at least we agree on something.