For me, the question of a broccoli base or tabbed/slotted is usually not much of a consideration. I look at the mini and pay little or no attention to what it's standing on. Sculpted bases are a different story. If they enhance the mini, so much the better, unless they are so huge and odd that it will make painting difficult.
Now, that being said...I dislike broccoli, wherever I smell it. ;-) I generally just spend the time to bury it or cut it off, but I'd prefer it not to exist at all. Tabbed/slotted may somewhat limit poses and basing options in some cases, but they tend to be the lesser of two evils. Still evil, but, hey, whatcha gonna do about it?
I understand why broccoli and tabbed bases exist from standpoints of marketing, consumer usage, sculpting, moldmaking, casting and final materials. For me, each mini purchased depends on the intended application. I look at it and think about the possibilities for RPG, tabletop skirmish or armies, leaders, the intended game system (limiting final base selection for size & shape), display, competition, gift, diorama, etc. If the mini passes muster, then I look at the base. The base alone is never the first consideration, seldom the deciding factor one way or the other, and never limits me to one manufacturer or avoiding another.