LOVE:
Goldberg - First of all, the theme "Invasion" was strictly instrumental. Goldberg didn't need lyrics. He didn't need anyone saying anything about him because everyone knew what he was there to do. The pyros (spark shower) were cool at the time, though it has been used alot since then (sometimes unintentionally - see Jeff Hardy). Finally, he didn't take his time. He roared through the pyros, flexed his giant man-flabs and went to the ring without playing "look, my dick is bigger than yours" with the the fans.
Hulk Hogan - The one that started with a a minor tonality and was a bit slower a the beginning. "Real American" really got me hyped and when the Hulk came out and ripped that shirt off I always wanted to be the guy (of course I was like 6 at the time).
The Rock - The slow jam version. Just listen to a youtube of this and the crowd goes INSANE when the entrance begins, every time, without fail.
nWo - The wolfpack entrance. Meh, I was a fanboy.
Sting - WCW entrance. I loved when he would get crazy and come down fro the rafters. Too bad Owen Hart...no, that one is too easy and very tasteless, nevermind.
Diamond Dallas Page - I liked Nirvana and always thought that DDP came to the ring like a twelve year old that had an IV of pixie sticks for three days then got released in a toy shop. He was always so energetic, even in his later years.
Snitsky - Nah, just kidding.
CM Punk - I love his theme "This Fire Burns" and he always plays it up really well. He is getting lost in the shuffle at the moment as far as the roster is concered, and I always feel over-pumped for one of his matches because is entrance is quite good.
Edge - "Metallingus" and pyros...enough said.
HATE:
Kane - He just does nothing for me in his entrance. It used to be ok, but now it's just the same thing and has gotten really stale IMHO.
Taker - Same as above. It used to be amazing, but now it's just way too stale.
Samoa Joe - I think his entrance needs to be revamped. It isn't doing anything for him and it is kind of boring...funny.
Raven - I get the point, man. What about you? Get off your ass and get ready to wrestle you dick. Seriously. Your awesome in the ring, you have great charisma, but your entrance is boring.
I could probably come up with more, but these came to mind. Good thread idea...you get reppy love.