Its good in any case, EXT is very good at surviving power outages, as is many Linux filesystems.
This is because of most linux filesystems are journalized and from what I hear thats a very good thing.
Now so far Ubuntu is the only one I know that does a disk check every 20 or so boots, the others not so much but meh its nothing to panic about.
http://en.wikipedia.org/wiki/Journaling_file_system