I've had The House of the Dead 2 on both Dreamcast and Wii. Keeping in mind I've never played the House of the Dead 1 and 4, but there's a reason many consider it the best in the series. The branching paths, the necessary quick responses, unique boss battles...and campy cut-scenes, all make for an enjoyable experience.
It is, however, a bit on the difficult side (especially when you get deeper in to the game), and once you beat it, you usually aren't going to want to jump back in right away.
Outtrigger is one of those games that I felt I would have invested a lot of time in if the Dreamcast had a few more years left in it (unfortunately, it was released around the DC's demise and I looked for greener pastures once the announcement was made). What I played of it, I only played in a Dreamcast Magazine demo. I did find a lot to enjoy though: frenetic Sega-arcade gameplay, varied weapons & power-ups, etc. It was a different spin on your traditional first-person shooter (or third-person, if you wanted that perspective, too).
