Haven't made my purchase yet, but the Ford Flex is an unbelievable vehicle, it absolutely does not have a weak spot. It is fairly uncommon largely due to lack of marketing I think, and the polarizing styling of course.
I find the exterior styling to be perfection - no bullcrap swoopy doopy "crossover" styling with little rear windows and big blind spots, its a no-nonsense super practical and insanely stylish, classy exterior design that does not follow the pack. I give Ford a lot of credit for producing this vehicle. The only downside is the MyFord Touch (Microsoft) Infotainment system which continues to be buggy, but they release free updates about every month so I'm sure they'll soon get things ironed out.
You can get a barely-used Flex for an amazing price too, and this is actually Ford's most reliable model that after 5 years of production has been basically perfected with the same chassis and powertrain as the Edge crossover. The CX-9 and Highlander are nice vehicles, but much less funcitonal, much more expensive for the used market, and have less features compared to the Flex.
If the Pathfinder gets its powertrain issues ironed out it will still be at the top, neck and neck with the Flex.
If you like the Pathfinder, DO NOT sit in a Flex or drive a Flex, I guarantee you will have buyers remorse and wish you bought a Flex. Outside appearance is one thing, but experiencing the driving experience, interior comfort, smoooooth and powerfull powertrain, and perfect suspension is completely different.....Ford really hit the bullseye with the Flex (and I'm not a Ford fan, I own a 2008 Nissan Rogue, but I have to give credit where its due).