Before you take too many bad reviews into consideration, read this.
ROBLOX was designed to be a fun site where you can build your own place and make new friends. It definitely lives up to it's standards. There are thousands of users logging on every day. However, you should know that the game page is sometimes loaded with games that have negative concepts. "The Mad Murderer" is an example of these. There are also war groups, and... many games where people die, in general.
BUT THAT DOES NOT MEAN ALL GAMES ARE BAD. There are fun, safe games to play as well on ROBLOX, and if you are cautious, you can avoid bad games altogether. "Work at a Pizza Place" is a good example. ROBLOX can suggest games for you to play based on what you've already played. If you like a game, give it a thumbs up. If you don't, give it a thumbs down.
Nowadays, when you sign up for ROBLOX, based on your gender you are automatically given a terrible looking lego-like figure. Please remove this immediately. Most users discriminate against it and it is only ever used ironically. There are a few other free things you can get from the catalog that will make you fit in better.
Sometimes, users will swear on ROBLOX. They only do this because of the poor hashtag sensor system. If we all report the swearing people, we can prevent swearing altogether. Besides, they're all probably spoiled 6-year-olds who play Call of Duty, anyways.
Be warned that admin reports are poor. If you report a user, you better have a good, well-thought out reason that anybody can understand, or you yourself will be misunderstood, and banned for a couple of weeks.
IF YOU ARE SENSITIVE, I suggest you stay away from battle games like "Sword Fight on the Heights" if you aren't experienced with using a sword on ROBLOX.
PLEASE BE AWARE, ABOUT BATTLE GAMES, I think they're only accepted because all players re-appear at a checkpoint if they die. There is NO blood in battle games; the only thing that happens is the player's arms and head fall off and the body disappears, similar to in the LEGO video games.
The Forums are a pretty good way to socialize in the ROBLOX community. I recommend staying away from "Off Topic" and "All Things ROBLOX". Off Topic is full of "Trolls", and All Things ROBLOX is almost never on topic.
Be warned that the site's premium membership, "Builder's Club", is overly advertised. There are many features that require Builder's Club, such as having more than one ROBLOX place of your own open at a time, creating custom clothes, etc. Builder's Club isn't cheap, either. Before you discriminate against this, how much money do YOU think it cost to run a website with THOUSANDS of users who log in every day? The amount of resources on ROBLOX is so many that they need paying members.
If you are under 13, you can't talk unless a parent sets it so you can. They removed the safe-chat feature, so now users who sign up under 13 can't say anything unless a parent sets it so they can, which is hard to figure out how to do.
If you have a child playing ROBLOX, or are a child playing ROBLOX, I think ROBLOX is a good site. It requires you to download it's software, which is completely safe.
If you're worried about your kid doing bad things or playing bad games or wondering if they're getting their feelings hurt, or whatever you're wondering, just make your own account and follow them around secretly.
In closing, if you make a free account, choose your friends wisely, play games with caution, and report the bad stuff with good reasoning, I believe anyone can have a safe, fun experience on ROBLOX.