I don't think there's any technical difference between an ouija board, a deck of tarot cards, a pendulum, or any other device that could be used to speak with your unconscious, the Gods, or spirits. In my view, they're all just tools: a piece of wood and a plastic pointer, some pieces of card with pictures on, a piece of metal or stone hanging from a string.
To me, it's how I use my tools that makes the difference, and part of that is the subconscious ideas I get when I use my tools. If I pick up one of my tarot decks and I immediately think "this is a means of connecting with my higher Self and thus my Gods", I'll probably get very different results than if I think "tarot decks are the tools of the Devil".
If I were to use an ouija board, I would be very careful about creating a safe, protective atmosphere by smudging, sprinkling salt water, and lighting candles. This is because I've been conditioned, through the media, to immediately think of the ouija board as "a tool to speak with spirits, some of which are harmful".
I believe it's very possible to use an ouija board in the same manner as a tarot deck: to connect with your Higher Self, Spirit Guide, Gods, or the collective subconscious. But I think your subsconscious intent when you use the tool wll affect what the tool helps you do, so if you're expecting it to connect you with a random wandering spirit, that's what it'll probably do. If you still want to use an ouija board, I'd suggest creating a safe and protected space, since the nature of spirits is as varied as the nature of humans - most of them are reasonably nice, and some are incredibly wise, but some are incredibly harmful.
*puts in her 0.02*