I wouldn't say that I've found GCSEs easy but, in some cases, I'd built myself up to expect more from the exams than I actually got. I find GCSEs just to be a case of regurgitating facts and, to be honest, that's not challenging. The challenging part, of course, is remembering what you've learnt and using it correctly.
I feel I learnt everything pretty well but I made some silly mistakes in most of my exams and I wonder if I wrote what the examiner wanted for some questions. I can't say I found any exam easy and I really hate people who say that they did. I think you should only say it's easy if you had full marks and very few people actually get full marks. Unless you get full marks, you obviously didn't find everything "easy".