I used to read a lot of Spawn some years ago. I went back to the beginning a few months ago to really get into it and was frustrated by how many stories that seemed to just end very abruptly, without any satisfying ending whatsoever. Seems like a lot of the early Spawn stories crossed over with other comics and such they sometimes ended in those instead.
Other than that, I quite like Spawn. The artwork is really cool in that 90's kind of way, the story can be really good from time to time (a few aren't that very interesting though, but there are more good ones than bad ones at least) and it sets up a interesting mythology.
I would definitely recommend checking out some of the early stuff and give it a try.