Basically you get a single button for kicking, punching, blocking, and jumping. Its kinda hard because of the controls and camera angles. Basically you play as Jin and go through levels beating enemies. They added a new feature called 'Tekken : Devil Within'. Tekken 5 also has a kinda of cool character customization feature where you can buy items for characters, and customize colors of 3 sections.
The graphics are slightly higher then 4, and obviously alot better then Tekken 1 - 3. Now for the good parts, like Character movements and attacks are more smooth then previous games. Luckily you can't unlock him while playing the game normally. Now the end boss was the only part of the game I really didn't like, Unless you buy a gameshark and put the code in to unlock. So basically, you have to beat him as fast as possible without guarding and pray he doesn't use his death move. If you dodge, he can fire another one right after the first. And with an attack that does about 90% damage in a single hit with about a 1 second delay, its no fun. If you start learning his moves, he changes accordingly. The worst part of the game is when the end boss is so hard, that if you take a single hit, you are basically finished, it kinda takes away from the fun factor of the game.
I will start with the bad part because its short. So I am not new to this game, in fact I'm really good at it. Ive played Tekken from the first Playstation till Tekken 5.