Why wont the dae files load correctly?

am still using 2.69
tried importing a bunch of dae files.
only one worked sorta.
the rest were just dots with dotted lines.
tried scaling but that did not help.
no i wont be going past 2.69. I am sure it can handle old dae files

Trying one of the following:-
http://www.assimp.org/
http://www.open3mod.com/
http://www.meshlab.net/

How will they help blender load dae files better?
thanks