I've done aikido for about 4-5 years. Its not the most efficient style of self defence, to be learnt quickly and simply, but for a trained person it gives nearly unlimited understanding of movement, balance, constant control, distribution of mass, "flow", "the moment of intention of attack" etc etc etc - feelings, that would make any other martial art experience a lot deeper.
It's rather about opening own feelings and following them - meditation in movement, rather than simple techniques of "killemall".
Sometimes one feels like a jedi, making another person completely unbalanced (falling, "flying" etc.) by a very slight and narly non-visible from the side complex movements of the centre of mass, and just slightly modifying persons own movement "blending with him" - even funnier to do that without using any kind of force, just own weight.
I'd recommend videos on youtube like "Aikido Motion Capture - Gravity Clouds"
For a martial art, though, something more simple, physical force oriented and practical would do, though.
Styding aikido is really an art, giving so much more than just "fighting techniques"... and it takes considerable time, so its obviously not for everybody.