Because it is one of the most, if not THE most believable love stories I can think of. I completely believe that these two people are completely gaga over each other. They have connected on a core level that doesn’t make sense to most people, but makes perfect sense to them.
And in the way of the truest love, their love for each other helps to free them from their own self-loathing in a very honest, believable way.
Now, I am a complete sucker for a standard, bullshit, totally unrealistic bunch of fluff in a love story, but when it’s over I can forget about it because I recognize that it’s pure movie goo. No so “Secretary”.
If you haven’t seen it, you should.