Damn near about anything. They are a jack of many and master of none though. If you need a loader a skid steer will be better, if you need to dig a mini X would be better but if you need 1 machine that is very useful and getting it done fast isn't the priority then a TLB is the way to go. Its also nice if you can only move one machine with your truck/trailer and need to dig and load.
Knowledge is knowing a tomato is a fruit, wisdom is not using it in a fruit salad.