I think Kirby's a great main character for a few reasons: Kirbycides, *AIR GUARDING( what,in my opinion, stops Kirby from being bottom tier character..), **Mind games(HAAAAAIIIIIIIII!), and stone drop
* Air guarding is really what makes kirby and jigglypuff usable characters(in my opinion). Because kirby doesn't have any really big attacks(besides >b and fsmash) he has to needle his opponents to death by clever edge guarding and air guarding. During guarding you have a plethora of options. You could get above them and stone drop, fence of pain, hammer(i don't recommend this way), kirbycide them, or just use your aerials.
** mind games(not to infer you wouldn't know I just wanna clarify) can be used if your opponent's staying away from you...then you spam down taunt(during you can come up with a counter plan for when they go mad and attack you) eventually your opponent won't be able to take it, abandoned his/her plan and just charge at you.
And I believe why most people hate Kirby/jigglypuff b/c he's not a get out there and Tank your way through everything kinda character like Ike is(this why I believe Ike is so popular) You have to study techniques and get a correct feel for Kirby which may take a week or two. But I must say once you learn strategies, techniques, and start to develop your own of the formers, he becomes one of the best characters you can use.
Well I've said many good things, and I don't like to be based so heres the....
CONS
Slow movement
No real K.O moves
Light so easily K.O'd
Short Range
Lost most Kirbycides
^B has no recovery worth(but great for Ledge canceling and edge guarding)
Slow dash speed
Well I should list the...
PROS
Great Recovery
Kirbycides!
Two spikes
Copy ability
Can turn Opponents into projectiles(starshot)
Lowest crouch in the game
B/c he is not a very popular tournament character many people will not know how to handle Kirby's unusual combat abilities
FENCE OF PAIN
awesome sir and edge guaridng
remember these things: KIRBYCIDE< EDGE AND AIR GUARDING<, and MIND GAMES
********DO NOT BASE YOUR GAME OFF OF KIRBYCIDES**************IT'S BEST TO USE KIRBYCIDES WHEN YOUR OPPONENT HAS 1 STOCK ADN YOU AHVE 2 OR MORE.