After playing Brawl, I refuse to go back to Melee or 64 mainly because I cannot recover anymore.
Both 64 and Melees PKT feel awkward.
Fun Facts about PK Thunder
64:
In SSB64 Ness' PK Thunder seemed to have covered a wide range whenever he returned. It was also a bit hard to control. PK Thunder also lasts longer than it does in Melee and Brawl. Another thing about Ness' PK Thunder is when he used PK Thunder 2, he was able to fly through platforms. The pros about PKT2 is that Ness flies very far! The cons, which is probably just one thing, it doesn't kill opponents early on.
Melee:
In SSBM, Ness' PKT had to make a full circular turn in order to go vertical as well as horizontal. Of course starting up PKT, it'd go vertical in the first place. It's not as hard to control as it was in 64, but it doesn't last very long, either, which can make that PKT a pain to use since it has to make some strange turns. The thing about PKT in Melee is whenever you used it to recover, the camera would make it feel awkward.
In Melee, Ness is unable to fly through platforms from above while using PKT2. Like 64's, PKT2 isn't very powerful like it is in Brawl.
Brawl:
With the introduction of Lucas, players found his control over PKT to be far easier than Ness'. Unlike Lucas', Ness' PKT is quick, great for juggling and
can lead into some unpredictable situations. In Brawl, Ness' PKT is easier to control, but can cause him to fall into oblivion if not used correctly since it doesn't have that circular turning. In fact, things you could do in 64 and Melee with Ness' PKT2 are also a lot easier to pull off.
Of course, again, Ness can't fly through platforms from above with PKT2, but it's very lethal.