A guide is often for somebody who has a busy life, work, responsibilities or whatever and doesn't have the time to invest in scouting etc.
I've had good experiences with guides. IMO, really the way to go when you are in new to you territory.
A good guide is usually a referral from somebody who has used him or her before.
Guide packages come in all flavors, the Hunt, the party etc. I go to hunt, the food, entertainment and comfort level are secondary to me.
The best guide IMO is the one who drives you out and drops you off in game country at 3 A.M. and comes to pick you up after dark. Gives you detailed instructions on where to look and where not to go.