If you want something with a texture similar to meat, many mushrooms will do the job. If you want something reminiscent of ground beef, quinoa with seasoning will suffice. However, limiting yourself to vegetarian approaches of recreating meat dishes, then you are missing out on what good vegetarian food can be.
There are now enough great restaurants (as well as endless numbers of cook books) which can help you find very satisfying, or even excitingly new and wonderful meals that involve basic natural plants (and legumes etc.)
The problem for many people is they only know the "meat and potatoes" perspective. But they want to reduce their meat consumption, so they buy the meat replacement thing; and that replacement is not particularly healthy, nor is it usually a believable substitute. (It's hard to recreate the exact pleasure that comes from animal fats and proteins.)