cracked up to be?

[keannu]

They're leaving hospital after Jim, the husband was hospitalized due to an accident, and she says "cracked up". Is it "collapse due to a fatigue or something" or what else? I never get it!

-ghost whisperer

Jim- i know. I figured the hospital... you must be in hog heaven.

Melinda - You know, sometimes it's not all it's cracked up to be.

Jim- Who is it this time?
Melinda- A young woman about my age.

[5jj]

The hospital experience is not all it is claimed to be.

[SoothingDave]

be all it's cracked up to be - Idioms - by the Free Dictionary, Thesaurus and Encyclopedia.

[JMurray]

Jim- i know. I figured the hospital... you must be in hog heaven.
Melinda - You know, sometimes it's not all it's cracked up to be.

keannu.
The phrase "not all it's cracked up to be" means that it doesn't live up to its reputation. I don't know the whole context here but Jim is implying that Melinda must be enjoying her time at the hospital, "in hog heaven" is a largely US expression meaning happy or content in a situation.
Melinda is saying that it's not as good as you might expect.

not a teacher