Delivery has a decent, if not particularly fresh, premise: strange things start happening around a pregnant woman. It's filmed in the ubiquitous "found footage" style that too many low-budget horror projects use these days as a crutch to disguise poor production quality. In Delivery, however, the style is done well, and the production quality is good. The acting is solid, the pacing is tight, and the dialogue is believable enough. I noticed one plot hole (that the otherwise intelligent couple want to have a home birth with a midwife despite being an extremely high-risk pregnancy), but it doesn't ruin the movie at all. This is really more of a thriller than a traditional horror, as it's more creepy and tense than scary.
All in all, I'm glad I saw Delivery, it was an enjoyable way to spend a rainy Saturday night, even if it wasn't a classic on par with Rosemary's Baby, lol.