I can't watch my DVD

I received Gunparade March on DVD yesterday from Blockbuster Online (its anime so you probably never heard of the title before) and I saw that it had all these scratches and stuff and it was actually cracked a little in the center. I thought, why not, lets give it a try in the DVD player. Amazingly I was able to watch 2 out of 4 episodes on the disc. I have many many DVD players in my home (if I count my computers, I think I have 6 all together) and none of them would play all of episode 3 and it wouldn't even load 4. I sent a request to Blockbuster to send me another disc. I'm hopeful that this one won't be as bad. There are over 72 movies in the que, so I should be able to stay entertained for quite a while over the next few months :)