I find the soundtrack to be pleasant, easy listening. That, however, is NOT what Evita is. Evita is exciting, larger than life and sometimes a little strange. For me, that is what the OBC is.
I'm not the biggest Lupone fan (never found her to be anything special in Gypsy), but her work on Evita is extraordinary. There is some tension in her voice on the cast recording, but what do you expect? It was recorded over the course of two weeks while she was doing the LA run at the same time. Only Wonder Woman could get through all of that unharmed. If you go to "that site," there is audio from the soundboard of the opening night on Broadway. Listen to it. It's thrilling and Lupone has never sounded better singing the score.
The orchestrations on the OBC are better than on the OLC and the tempos are faster, not to mention it's the entire score (not highlights). The soundtrack has some really lush, elegant orchestrations (though every now and then it sounds very, well, 90's) and they do an admirable job of working around Madonna's limited range, but songs that should knock you over like "Rainbow High" and "A New Argentina" just don't register. Also, they totally sanitize Eva Peron on the soundtrack, giving all of her coldest, sassiest and powerful lyrics to other characters or just eliminating them all together ("But your despicable class is dead...", "Who the hell does the King of England think he is..." ALL of "Dice are Rolling").
It also changes the dynamic between Eva and Che, as well as Eva's placement in the whole show. In the movie, Eva never does, well, ANYTHING. We see her do a lot of charity and dance with different men and that's it. I remember while Che would sing about her crooked doings, I would always think "What is it that she's actually DOING?" There's no danger to Madonna's Evita. She's just there: singing fairly well and looking pretty.
"Sing the words, Patti!!!!" Stephen Sondheim to Patti LuPone.