My 3 year old is very eager to help me test this, so here's our experience so far.
So far, under the default Win 98 bottle, the games do not require any actual installation. The game is started by browsing the CD and simply clicking the appropriate .exe file. Crossover automatically takes over and starts the program. The splash screen pops up and away you go! There are several "Putt Putt" games. The one my daughter and I just finished playing is "Putt Putt Travels Through Time."
Thus far, I have not experienced any problems whatsoever with actual game play -- seems to work pretty much as is does on Windows. Both the graphics and sound are good.
However, if you click the "quit" button, the game pauses but the standard Load/Save/Quit menu does not appear as it should. A work around -- at least for the Travels Through Time game -- is to use the keyboard shortcuts (S for Save, L for Load, etc.)