Roblox is a platform where most worlds and games are created by users like you. Therefore, it is normal that you will find faulty or badly made creations. Nevertheless, you must always show good behavior when playing Roblox. Be respectful and treat users kindly.
This way you will not be excluded from the worlds, you will be well received by everyone and you will receive more visitor medals (the most appreciated by the community). The more places you visit, the more Visitor Medals you receive as long as you behave. These types of medals will encourage users to invite you into their worlds. If you do not have many Visitor Medals, it is unlikely that you will receive invitations.