The first scene(s) in Legion are truly ingenious, one of those "What on earth is going on?" type games. It took me quite a while to figure out what was even possible, but I had fun exploring. There is basically one important verb that you can try on everything, and then reading in-game clues should give you some ideas of what else to do.
Once the game transitions into it's second section (signified by changes in the in-game color), it becomes a bit more standard, similar to Babel and the many games inspired by it. It uses some profane language, which is mostly appropriate for the nature of the person and the situation. The puzzles are still very good, the writing is still good, but the opening is so great that the rest of the game pales in comparison.