The Good: Two modes in one game, cheesy dialog and voice acting makes the game funnier, crazy monsters
The Bad: Ugly and dated visuals, playing through the game twice may seem boring, extras not worth unlocking
The House of the Dead was a hit zombie light gun game back in the 90's in the arcades. This huge Sega hit spawned a game called Typing of the Dead that featured Agent G and heroes wielding keyboards instead of guns. The game was highly addictive as words and sentences popped up on enemies. If you typed everything correctly the zombie would die. A reimagining using the Wii hit House of the Dead: Overkill takes the main game and turns it into a keyboard typing fest and it's a blast.
The story and voice acting is intentionally left to be cheesy to make fun of the absolutely abysmal voice acting from the original games. It adds a comedy factor. While it's not nearly as bad as previous games it's still enough to bring back memories. Agent G and Washington are after a man named Papa Caesar who has somehow killed Washington's father and released a zombie virus among the world. Along the way you meet various characters, but non of them are really memorable. The wacky story and over the top adult content such as swearing and gore is a blast.
The game is on rails like any light gun shooter. As zombies pop up you just type away with what you see. Each level is unique with its own themed zombies and bosses. The zombies are well done and the game can be some times down right gross. The bosses are both funny and disgusting to look at, but overall the typing portion of the game is only as difficult as your typing skills permit. Thankfully you don't have to include punctuation or anything like that. Just type what you see as fast as you can. Some times you have to save civilians for more points, but outside killing zombies there's nothing else in the levels. If you spam the Tab key you can get all the hidden extras which makes it much easier to unlock everything.
Thankfully this is only half the game. The other half is the actual light gun game using the mouse to shoot. Basically it's two games in one, but if you play through one it will be tough to get through another due to repetition. It's not like you can choose another ending or go down multiple paths. The game is really only good for one play through unless you are extremely bored. The extras aren't really anything worth unlocking either.
For what it is the game offers a lot of content for the small price, but playing through the game twice in different modes just doesn't seem appealing for the amounts of cheese the game layers on.