Stop me if you know this feeling. You find a critique group only to discover its members are where you were five years ago. Their comments are glowing because they don't know what to say, or else they're pedantic nitpicks that don't help you improve.* You'd prefer a critique from that recently-agented blogger you follow (or Neil Gaiman, if we're being honest), but they stopped answering your e-mails after that "I'll show you mine if you show me yours" comment you made on their blog.
What are you supposed to do?
Fortunately, God and Al Gore made the internet. Do you know how many unpublished authors of every skill level are out there? Thousands. Blogging, commenting, tweeting, and most importantly, critiquing. What you need to do is find the ones who (a) are around (or above!) your skill level and (b) like you a little. Then ask as politely as possible if they want to swap critiques.
How do you know if they like you? Comment on their blog, respond to their tweets, and be a friend. Don't be creepy. Don't be overly-friendly if you hardly know them. And DON'T interact just to get a critique (people can smell that).
How do you know their skill level? Most of the time you don't until you swap a critique. But generally, I say if you've got the time then swap. You can learn something even from beginners, and friends are friends regardless of (current) skill level.
Critiquing an 80,000-word manuscript is a big undertaking, so you need to know what you're asking of people. This is why you swap. This is why you're always professional. This is why you're understanding if they say no, regardless of the reason.
And this is why you're always, always thankful when someone does accept your offer. Even if this is the only manuscript of yours they read, you're making a friend, and that counts for a lot.
* I once got a critique for Pawn's Gambit that said, "Let me send you a story written in Scottish dialect. You deserve it for the headache I got from reading your story.... I suspect no matter what I say you're going to continue trying to write fantasy dialog."
Fortunately, by then I'd had so many people tell me they loved Air Pirates slang that the critique just made me laugh.