If you can tolerate dairy and the protein shake does not include anything you don't want in it (fillers like soy, preservatives, artificial sweeteners or the like), I'd say go for it. That being said, in my experience it was difficult to find a protein shake that didn't have anything like that in there. A good person to ask about the best brand to use might be Amy (username 4milesat40, the founder, moderator and administrator of this Paleo board) since she regularly used them before embarking on her Whole30 recently.

I drink Shakeology shakes, it is a quick easy meal replacement.

Personally, I've got no problem with protein shakes. Then again, I'm more Primal than Paleo, so it may not matter what I think - not gonna stop me from sharing my opinion, anyway.

There's no real shame in using one. Whether it be whey, egg white, rice, whatever - if your goal is to get that protein to your muscles quickly after a hard workout, then by all means use one. I'd never use it as a meal replacement; typically after a workout (like today - my legs now punish me) I'll just have a scoop in a bottle I'll shake on up in the changing rooms and down it there, then walk (or, limp) on down to McDonalds down the road for a coffee and a meal of grilled chicken/steak/goat/whatever and sweet potato chips. Hell, can even mix any remaining protein liquid into the coffee, if you're feeling "kinky".
Protein powder's also brilliant to bake with, if you're into that. Couple of scoops, couple of eggs, maybe a bit of buttermilk and - bam! - protein pancakes. Goes brilliantly with banana fried into it, and blueberries if you're using vanilla.

I don't see why there would be any reason to not use one, even if avoiding dairy, because, well... it doesn't really seem like dairy. I've never really had a protein shake and tasted/felt any comparison to a glass of milk, or cream or a piece if cheese. Just think of it as... raw cow milk that... uh... dried up in the sun because the calf was being really picky that day, and then later on you stumbled across it (after a hard day of lifting rocks, climbing trees and, uh, stuff) and just scooped it off the ground and ate it. Om nom. How nutritious and convenient.
Yep. Pretty legit?
But seriously, If it's really a big deal, you could just make your own. Eggs work brilliantly.

My only real complaint with protein shakes would be how they always seem to explode when I shake them, Every single time. Though that me be on behalf on the cheap shaker I use. Ah, well.

I drink protein shakes, using unsweetened almond milk.

I use an egg, egg white, MCT oil and stevia blend I buy online (truenutrition.com). Effectively, these are all things I'd eat anyway, so... I'm good with that. I just don't really know that I could dry eggs in my dehydrator (though I might try it out of curiosity).