If you like Fate, Tsukihime, or Type-Moon in general, you'll probably like Carnival Phantasm. It's funny, it has cute girls, and the episodes only last for about 10 minutes.
My biggest issue with Carnival Phantasm is that we didn't get to see the Fate and Tsukihime characters interact that much. The content of these series was largely separate, which I feel goes against the main draw of Carnival Phantasm.
As someone who only really knows Fate from the Type-Mooniverse, sure, I liked seeing the Fate characters in Carnival Phantasm. But, I was actually a lot more interested in the "new to me" Tsukihime characters.
Carnival Phantasm is a celebration of everything Type-Moon (2011 and earlier). But, not in the way I was expecting. There wasn't really that much crossover content. #CarnivalPhantasm