To be fair, there are thousands of multiclass options and only a very small handful that I'd consider cheesy.

Like, druid 9 / monk 1 is not a "jumbled mess of colors" but is a "black spaceship with an accent". I see nothing wrong with a druid who has trained (in a monastery) to be better at unarmed combat at the expense of spellcasting; and a good GM can tell the difference between an actual reason and a sloppy after-the-fact justification.

Conversely, if you end up with something like paladin 2 / monk 3 / bloodrager 1 / slayer 4 / cleric 1, then that would be a "jumbled mess of colors".