Yes you can play the packs as they are, but I really wouldn't recommend a person completely new to modded MC to start out with a beta pack that might at any time require world resets etc. Someone slightly experienced might get through any issues that arises, but it would be a shame for someone new to loose interest all together because their first exposure was a buggy beta.
But if you do decide to go with any of the beta packs, make sure you stay with the recommended version of them at least. Don't blindly skip ahead to the latest version, they are highly likely to contain bugs.