Rattle on front end - especially when hit bumps. Is this struts? How dangerous is the problem?

Does it make the noise (or does the noise get louder) when you're cornering? And is it worse when you turn in one direction than it is when you turn the opposite direction? If so it sounds to me like one or both of your constant velocity (CV) joints is/are worn.

CV joints are front wheel drive's equivalent to U joints, you'll find one in each half-shaft (that connects the transaxle to each of the front wheels.) CV joints are protected from road dirt by rubberized boots; any damage to a boot is often followed by premature failure of the joint.

Your tire shop or general mechanic should be able to easily tell you if this is the problem. Luckily there isn't a great deal of danger associated with CV joint failure (as opposed to U joint failure on a rear-wheel drive car, which has potential to be extremely dangerous) but you should still get it checked out soon, to make sure there's nothing else going on, if no other reason.

Good luck!

I would start with checking the muffler and pipes to see if they move when u push on them. Make sure car has set for a while so u don't get burned

They are all the same unbolt and replace

Check the front suspension. Could be numerous of things. Sway links could be worn out, front struts could be time to replace, or a engine or transmission mount is bad.

Check all the bushings and make sure they are not loose. General Motors bushings are prone to cracking.

If the problem goes away when brake is applied, then a loose brake bad or missing pad clip is possible. Either way, you should have it inspected. A loose brake pad is not dangerous at all, but something else loose under there could be potentially catastrophic, such as a tie-rod end or a ball joint.

This sounds like a bad strut, one or both on the front has gone bad. Here is a picture of just the strut with out the spring. The price ranges from $65.00 to $220.00 depends on what you can afford.

have you checked the sway bar end link bushings?

According to the replacement parts guide, they are struts and I checked for all wheel drive and 2 wheel drive and all are showing struts.

My guess is a strut bushing/bearing, but have your front end checked out by good shop to make sure it isn't something else more dangerous.