This game's unfinished, that's for sure, but it's still oddly really solid. The slide, Protoman, and more thoroughly balanced level design make it a step up from 1 and 2. Most people really hate the Doc Robot stages, but I honestly really like them, minus the Doc Robot fights themselves. Revisiting stages in a darker, decaying state at a higher difficulty while you have access to all weapons is an insanely raw concept.