I'm a 2nd year Adult Nursing student, about to go out on placement 5. I've had excellent and miserable experiences on placement, as have most of my cohort and other qualified and non-qualified friends. Bad placements happen in all branches of nursing, unfortunately. As you will learn, good and bad experiences are an essential part of being a nurse and you will find yourself reflecting on them (reflection is a big deal in nursing!). Bad placements will happen but it's how you deal with them that counts. Get support from the link lecturer and your personal tutor but above all, don't let it get you down. I had a placement that ended every day with me sitting in floods of tears in my car. Not nice but I learnt a lot from it. It taught me how NOT to be a nurse/mentor.
Good luck!