BG1/2 companions were better on many points. The only thing they didn't have was a side quest divided in chapters/act and the "origin/,playable as main characters thing" (which is only appealing in MP).
Quantity is objective. Quality is not at all.
It's only your opinion, not a fact.
The fact is, that BG1 companions were in most cases only a portraits with attached set of sounds. Very little interactions, very little personal quests.
Obviously BG2 improved it a lot, but most of the companions didn't have any significant personal quests.