Pretty unsurprising. Part of me feels that I should be annoyed or mad. And yet, I'm not.
'Course. I've never really been too bothered by opening endings. The whole "And life kept going on" aspect to them has always had a kind of appeal to me.
...I do kinda wish we got to see all of them get nasty together. But that was never in the cards sadly.
Imagine Daisuke pulling a Rex from Xenoblade here. Like the next series Anbe-sensei made and we see Daisuke legitimate became a husband to all of them.
So no body is mad at the ending right? I mean the manga wasn't one of those where it was story driven. It took nearly 100 chapters for romance to really be possible. With this ending I think it's ok. If it was a manga like Nisekoi, I'd be really upset with this ending but I guess it fits.
Open harem ending is a coward's way out. At least, go with an actual harem ending (where all agrees to go out with each other) or pick one out of those girls for that ending.