I took intro physics and math courses 2 years ago and intro CSE 1 year ago at a large American public school.

The physics classes are easy. I mean, really easy. You don't need instructor interaction or TA help to perfect every test in intro physics courses. It's the same for intro calculus, with the caveat that you need to be good at algebra or quick with a TI-89 to perfect calc. I had a lot of fun in physics, and I had a great professor who effectively used clickers by passing around a sheet with big numbers printed on it. He'd ask us a multiple-choice question and we'd fold/display our answer.

CSE was a little different, since there's homework to be done and it was harder to get a 4.0. This one will vary from school to school more than physics I think.