Parity in the league is pretty good in my opinion, so it only takes one injury or underperforming star/import to change a team's fortunes.
Can't be bothered looking up the stats, but I think Adelaide actually had a pretty good record last season in the (limited) games Talbot played. Same with Bendigo Spirit last year- good record in the games Kelsey Griffin played, but missed finals because of their poor record in the games she didn't play.
Also, it seems to me as though wins and losses somehow mean less in WNBL than other leagues in terms of support, sponsors, etc.?
e g. Canberra haven't been winning much recently but appear to still have some of the biggest crowds. Even though they aren't winning they play a fun up-tempo style and compete hard, which seems to be enough to keep the fans and sponsors happy (plus it helps to have Jade as the face of the team!)