I enjoyed Usagi Drop, but I will agree with you that it might not be something that encourages a lot of discussion. (Unless you want to talk about the manga, and quite frankly, the less said about it, the better.)
If you're looking for something that strikes that down-to-earth cord, while tackling a really hard subject, (One controversial enough that it likely will spark a good amount of discussion.) I'd highly suggest you check out Wandering Son. Its art style is in fact very reminiscent of Usagi Drop's anime adaptation, but it's definitely better realized, mostly due to its stupendous production value.
Maybe go check it out without reading anything about it first. You might be surprised.
It's available for free on Crunchy Roll, in case you feel like checking it out.
Wandering Son might have a bit more fat to chew on than Usagi Drop did, but you're not going to go wrong with either, since they're both absolutely fantastic. If Tom's afraid that Usagi Drop might be a bit too little to write about, checking out the first episode of Wandering Son's a GREAT suggestion.
+1 to Sophism