Thought the core story for "Delirium" has a number of elements that should be familiar to those who have been around the horror and thriller block a fair amount of times, I think that the end results could still have worked under more capable hands. If you guessed from that last statement that I didn't think too much of it, you would be correct. This isn't the worst horror thriller I have seen, I admit. Typical for Blumhouse productions, it looks fine for what was a limited budget. And I admit that I was never bored at any moment, even when it rehashed elements I had seen before. However, it saddled with some severe problems. It's quite slow-moving at times, enough that you'll start to think that the screenwriter and the director were simply padding things out. There are also some missing details that suggest that some explanation for them either wasn't filmed or was left on the cutting room floor. A bigger problem is that the movie isn't particularly scary or suspenseful, possibly because of all those familiar elements in it. The director doesn't seem to have worked very hard to try to present these familiar elements in a fresh light. The movie does manage to pass the time in a relatively painless fashion, but that's all it really does - there is nothing that will make you remember it for a long time afterwards, or give you the desire to sit through it again.
