They aren't entirely trouble free but they are well worth the effort given the extra room they provide. There are many different types and configurations and some are better than others. Also some or the stuff you’ve probably read may be about old problems that have been addressed and solved by the manufacturers.
So it just comes down to research. I wouldn’t avoid an RV because it has slides, quite the opposite. But I would also find out what type of slide mechanism it has and do some research to find out if it had issues, if they were resolved, etc. Also slides add weight to an RV and require some maintenance so those are things to consider.
I have four slides on mine and I really enjoy the room they provide. But I have done some work on them, I’ve paid to have some work done on them, and Ive replaced a control module for one of them. But even with all that I’d rather have my slides, maintain them as necessary, and deal with issues as they arise, than live without them.