Mel Blanc. Hands down. (Mel Blanc did Bugs Bunny, for the record, Shenlong.)
He's the genius who's done almost every old cartoon voice you can think of. (Bugs Bunny, Daffy Duck, Porky Pig, Sylvester, Tweety, Granny, all those grand ol' Warner guys.) He was so good, that he could do a voice imitating a voice. Like Bugs Bunny being Lucy from I love Lucy.
I already knew that Mel Blanc did the original voice of Bugs Bunny, Billy West is actually the current voice of Bugs since he did the voice of him in Space Jam so that makes West a successor for Blanc. Btw, Blanc didn't do the voice of Granny, he only did every major male Looney Tunes characters. I also agree with you also that Mel Blanc is a true voice acting genius.
Oh and here's another voice acting genius you guys should acknowlegde also. Frank Welker. For almost 40 years, Welker has been referred to in Hollywood as a "voice god".
Even though he does voice of Fred Jones from Scooby Doo, he is often cast in animated production as the "voice" of various animal characters.
He also sas shared two roles with Leonard Nimoy. When the third season of "Transformers" (1984) came around, Frank took the role of Galvatron that Leonard Nimoy had taken in The Transformers: The Movie (1986). And in Star Trek III: The Search for Spock (1984), Frank provided the 'screams' of Leonard Nimoy's most famous character, Mr Spock.
Provided the voice for 8 of the original 14 Decepticons in the "Transformers" (1984) cartoon: Megatron, Soundwave, Skywarp, Lazerbeak, Rumble, Frenzy, Ravage, and Buzzsaw. He voiced two of the original Autobots as well: Trailbreaker and Mirage, as well as one of the Dinobots (Sludge) that also appeared in the first season.
He has done every voicing of Freddy "Fred" Jones for the Scooby-Doo series with the sole exception of "A Pup Named Scooby-Doo" (1988). Even in parodies and cameos on different TV shows, he has always done his voice.
Has done voices for both the original Star Trek film series and the television series "Star Trek: Voyager" (1995).
He also did the animal voice effects including "Dumbo" in Who Framed Roger Rabbit (1988).
In "Tiny Toon Adventures" (1990), he voiced Furrball, Gogo Dodo, Calamity Coyote, Little Beeper, Byron Basset, Uncle Stinky Pig, Henry Bear and Ralph the Guard, who later appeared in "Animaniacs" (1993), where Frank not only voiced Ralph, but also voiced Thaddeus Plotz, Buttons, Runt, Flavio Hippo and Chicken Boo!!! Welker is truly remarkable!! :O
Oh and as for the voice actors I hate, I say its Charlie Adler. I friggin's hate this guys cuz not only his voice acting is irritating but it's also very obnoxious and annoying too especially in ugh Brandy and Mr. Whiskers. However, he's only good roles that he did was Buster Bunny in Tiny Toons and Mr. Big Head in Rocko's Modern Life.
I also hate every other voice actors in 4Kids Entertainmet too since they just plain suck at voice acting in general.