I liked all four episodes of Winx Club Season 2 because they're the continued parts of Season 2 finale where the Winx, Specialist and the Pixies finally face off with Darkar in the final showndown.
However I do wished that the final two episodes of Season 2 have improve just a little bit because after Bloom is kidnapped by the fake Professor Avalon and brought her to Darkar's fortress were he turn her to Dark Bloom the Fake Professor Avalon was never seen again which doesn't really make sense.
I mean the Fake Professor Avalon could have fight both the Winx and Special in episode 25 as a distraction while Darkar and Dark Bloom enter the realm of relix. Then in the final confront the Winx could used their combine powers to destroy the Fake Professor Avalon once and for all. Still at least the Winx Club Special: The Shadow Phoenix we got to see Darkar disguise as Professor Avalon made up for this.