UK standards tend to be better too.
Yeah, sure....
Now let's see:
Yes, you can do it in 28 days, BUT this means that you will have studied all the theory beforehand and passed the written test pretty much straight after arriving at your school.
Forget the BS about weather being different - if you can only fly in the weather you've trained in, then you better stay away from airplanes anyway. RT is different, but that's not difficult to learn.
What I would steer clear of are the Florida 'sausage factories'. There are loads of smaller schools in the US where you can do it in about a month and actually learn quite a bit more than in the UK, e.g. flying 'in the system' (controlled airspace) and at night.