Yea it was far from a great ending but it wasn't that bad. I was disappointed that they couldn't even have a proper confession, not even at the very end. But at least the author made it obvious they would end up together.
The manga was a great story I could easily re-read and re-watch the anime on occasions, its still a bit of a sad ending with his mother staying behind and finding about her nature, especially how it affected her family. But overall it was a alright ending and a great story.