Why ?

Because it has several complete event command to use such as massage ,switch operation, wait , comment , loop, conditional brance and so many command.

It also has rpg command to help you to make

rpg game only such as

Enter hero name , change Hp and Change Sp too .

What ?

you can drag a

picture from beside to you game just only one click and drop it in your game.

Then you can create your picture by use only paint or photoshop.

How ?

for example you can create your own system

by use command or script and you can modify program for you game too.

Finally , for every resson ,I think it enough to say Rpg maker xp is a best and good game engine for people to make their game wihoutprogamming skill but use the dream instread.