Just starting in Unity, and when scripting I’m not getting sensible auto-complete smartcode suggestions. eg. Typing
turn_dir = 1 * Mathf.
I’m not prompted for any Mathf. methods but a list of absolutely everything starting with AccelerationEvent. It makes it very hard to code as I haven’t a point of reference and need to memorise every single method of every single class! :o
If you’re using Javascript I’m pretty sure autocomplete just doesn’t work, at least out of the box. With C# however it should work, so something is wrong.
Assets → Sync Monodevelop project might help.
Oh, I’m using JS. Boohoo. 
use c#
Use whatever language you feel comfortable in (though C# is more useful in the long run and is worth learning).
I use UnityScript and autocomplete has always worked fine for me.
Autocomplete with Unity script is fine for me too, although occasionally a bit slow.