Quote Originally Posted by Anonymouswizard View Post
Multiclassing also occasionally leads to the weak unfocused character, which is just as much of a problem (except in the occasional circumstances who m where I've seen players roll incredibly good stats and device to max-min because they can actually afford a bad build). And sometimes players who can't op to save their life will insist on branching out, inevitably making the game less fun for them when they can't keep up...
D&D multiclassing is a high-risk high-reward strategy in my experience. You can carefully pick the right levels in the right combination... or you can just go with what feels right and wind up with an unfocused mess of a character. 5E at least makes it less likely to end up with a complete trainwreck, which in 3E was very easy if you didn't know exactly what you were doing.