crossfit gym

I think the answer you will get is:
Crossfit is expensive -- up to $175 a month.
Crossfit is fun -- the workouts are different every day, and you meet the people you work out with. You interact with them and they become friends/partners.Plus, you push sleds, lift tires, climb ropes, jump -- a little more interesting than hanging on to the same old barbell every time in.
Crossfit is demanding -- unlike just lifting weights in the gym, most CrossFit workouts have a heavy dose of cardio. The lifts are compound lifts -- Olympic-type lifts mostly. And, most important, it is like you are working out with a personal trainer every time. There is the guy who runs the WOD (workout of the day), who pushes you, and you are competing against yourself (for time, etc.) and the others in the session.
Crossfit may have more injuries than Gold's Gym -- You are doing movements fast and you are doing heavy lifting fast. That can be inherently risky. People will tell you Crossfit is rife with injuries.
However, in every 'box' I have ever, the trainers stress proper form and they work on it with you. If you are not ready to do the prescribed weight/exercise, they will modify it for you.
Moreover, I go to the 'Y' and I hear stories every time I go about some guy who has torn his bicep, or slipped a disc doing squats, or had the leg press sled fall on his legs and break them. The point being: Whatever you do there is a little hazard. They say that something like 60 percent of runners -- running! No contact, no weights, no rapid changes of direction! -- suffer an injury every year.