I’ve only perused it briefly, but what little I’ve seen gave me the impression that 5E is a bit of a return to D&D/AD&D’s roots. I’ve heard some compare it to 3E, and I can see enough parallels that I won’t refute that. However, it’s also more streamlined without being “dumbed down”. Some have said it’s the most newb-friendly edition so far, and compared to previous editions, 5E is simpler from the mechanics standpoint.
I personally would not buy it simply because I prefer more open character design than the class/level system of D&D allows, but that is a personal opinion that should not be used to judge the actual merits of 5E. Since you seem to like class/level systems more than I do, 5E may be more desirable for you than it is for me. It’s definitely worth considering if you liked 2E or 3E… though possibly a little too simple if you liked 1E most.
WotC does have a couple of free PDFs that give enough of a look at the system to get a feel for it and how it compares to previous editions. Maybe reading them will help you decide without the hassles and risks of torrenting. It’s hard finding a good torrent; so many are crap quality.
Quickstart Players Handbook
Quickstart DM’s Guide