Let’s start like this: This is a great comic.  You should read it.

Okay, now that that’s out of the way…These issues re-tell the events of and around Avengers #1 with a lot more detail and fun flourishes.  We get better understanding of why Loki selected Hulk to be his pawn, a more thorough origin for Rick Jones’ Teen Brigade, a ridiculously fun side-track with Hulk hiding out as a circus freak…

When the Loki threat is taken care of they agree to form a team…

…And even there, Joe Casey and Phil Noto offer some context for why Hulk joined…

There is nothing bad here and zero reasons not to read these issues.