I thought the Xindi story arc HELPED. I really like that arc in Ent.
I hate it when people say it wasn't canon. I say "why not?" Just because the attack on Earth had never been mentioned in a previous episode or movie does NOT mean it could have never taken place. I say this in order to deflect any future posts making that complaint, which I have heard before.
To secure the peace is to prepare for war. -Metallica