Clint_L
Legend
I don't find multi-classing makes that much of a difference in character power. Certainly it's true in 5e, as in almost any other RPG I've ever played, that players who know what they are doing can build more effective characters. But I think 5e is fairly exceptional in how well it does balance.This is the thing that makes me hate multiclassing as it currently exists in 5e.
It is a tool for people who have system mastery to "generally be better in terms of power," while people who are just noodling with the system or trying to realize a character concept usually fall into the "detriment" trap because they're not actively looking for synergies and trying to maximize their power.
There are a few combinations that stand out, just as there have been a few species/feat combinations and so on. But generally speaking I don't find multi-classed characters to be an issue in my games.