Seems like Humble Monthly is finally running out of good titles to bundle ... But The Witness for $12 is a new historical low; worth considering a buy just for that single game, even if the rest turns out to be as lame as this month's selection.
My impression from teh last few offerings is that they are shifting heaviyl towards "the one game people would pay $12 for + some goddies". 88% off on 'some random stuff' just does not cut it, on its own, for most people,
This month's bundle was 'ok' but last month had a couple of really nice titles including Xcom 2. In fact I'd argue that there hasn't been a 'bad' bundle yet, almost everything has never been a duplicate for me and this is coming from someone that has a 700+ game library on Steam. It's well worth the $12, there is no other bundle that comes close to it.
To illustrate my point:
Last month highlights was Xcom 2, Ryse, Abzu and Steamworld Heist
January - Warhammer Vermintide, Project Cars and Trails in the Sky
December - Dragon's Dogma, Mordheim, Hacknet
The thing I like about the monthly bundle is it is very rare you will get titles in there that have been bundled before.