no, it wasn't. the gameplay goes down the drain sometime during the second one. well, the second one was fun all the way through, for me ... after that, not so much. from a gameplay standpoint, the fourth one is sheer torture, both because the gameplay is totally stale, and the designers put the dumbest shit in that one.
however....
the story really picks up towards the end. if you watch the included OAV discs and play the games, it really comes together super nicely in a very interesting way and the plot is very good. i enjoyed that aspect of it immensely.
so. if you can put up with the gameplay, you'll be rewarded. if you can't, you won't. also, a lot of the cool shit in the later discs is optional, but i didn't want to do any of it because i was so sick of the games. meh.