You used to be able to see a custom feed of a selected friend lists but since they removed that option the site has been completely unusable, unless perhaps you do something like remove 90% of your "friends" and groups but that would hurt usability in different ways.
I liked more the Facebook that showed me the humblebrag posts of my friends/connections (and I'm not being sarcastic)
The topic is FB groups. They aren't spam, at least for those I'm a member. Some groups may be quiet, some are active, but I don't recall coming across spam posts from any of them. A particular group has a rule that members can promote their business once a week, enforced by the group's admin