Actually, Touch Detective is the most traditional type adventure game to hit the DS yet. Its got charm coming out of the wazoo, a really good localization, has a sweet sense of humor, and really adorable art.
Its also got really sucky puzzles, and the only challenge comes from cycling through your inventory at a given spot and then moving on, you will spend LOTS of time treading similar ground over and over again. So while the production values are MUCH nicer then say, Trace Memory, the gameplay isn't even as good (ouch).
Stick with PW 1 and 2, Hotel Dusk also doesn't suck. Touch Detective is good, but only if you're the type of dude who's hardcore into adventure games (me) and doesn't mind playing one where the puzzles are shite due to the addiction to the genre (me again).
1st EB post, yea!