I made a team a while back as a joke, and it never even got the name right...
it was supposed to be "We Hate Teams" but it only did "We Hate"... I am just getting annoyed with all the new notices of a team created on every new project... Is there a central point where I can kill it or do I have to go to each project?

really? 117 views and no suggestions?

Judging by the huge number of answers, I guess the only way is by doing what you suggested... but you can try also to create the same team (with same email, password, and so on) on Boinc-wide teams; I just saw a "Delete account and teams" link there which might work

Good luck