I bought the LucasArts Classic Adventure Games pack from Steam a while ago, and I finally got around to beating the last of them (Indiana Jones and the Last Crusade).  I found that it has not aged nearly as well as the other games in the pack (Loom, the Dig, and Indiana Jones and the Fate of Atlantis).  In particular, you can easily compare it to Indiana Jones and the Fate of Atlantis, and it's not a real pretty comparison.  Graphics are worse, puzzles are more inane (a common problem in adventure games), the game is more linear, and the interface is notably more clunky.  Plus, it still contains some 20 year old copy protection that requires you to go into the game manual in order to beat the game.  Not a huge deal, but something that inhibits immersion in the game.

I remember enjoying Fate of Atlantis a lot, maybe because it managed to get the tone right. Never even knew about Last Crusade until much later.
 
You tried Machinarium at all?  I liked its approach to some of its puzzles.

I've played Fate of Atlantis and I really really liked it. 
It had a good indy tone and didn't look too bad.

Played Fate of Atlantis on Amiga 500, loved it.

Fate of Atlantis was brilliant. 
 
I bought that pack too and I haven't really played much of the first Indy game. I also haven't gotten very far in Maniac Mansion either; I would say that the early SCUMM engine games just weren't that user friendly.