A rookie DBA may say "It is great that Oracle defines most of the parameters with default values" meanwhile a veteran DBA may declare "It is great that Oracle allows you to define most of its parameters", and the rest of the DBA's will be in the middle of those points of view. This position starts with the installation process. You may either let OUI make most of the decisions, assuming default values for most of the parameters and letting the user to define a minimum set of required parameters, or, on the other hand, you can take full control of the installation process.
OUI installation can be as easy as a Next → Next kind of installation. Starting from 10g Rel.1 Oracle decided to simplify the installation process as much as possible by gathering as few parameters as possible from the user. This installation mode is advantageous to a certain extent for the people who want to get started with Oracle as soon as they have the...