About JMonkey ABILITY

I wont to ask  can JMonke be use for creating a game like Splinter Cell or Prins of Persia for example

I dont talk abaut me i talk in general case

If same time want to make a game with this ENGINE

will this game willi looks profeshanal with haig grafics and oder thank u befor

Check this discussion here: http://www.jmonkeyengine.com/jmeforum/index.php?topic=8529.0

The engine will influence performance and things like advanced effects. No engine will make your game look good or bad.

How professional the game looks is (IMO) all to do with how professional your graphics assets are, and how slick your code is.

Sloppy code, badly animated models and badly drawn textures + Crysis engine will get you a awful looking game.

Decent assets and the right code + a far less advanced engine can get you Quake.