Where to start...
Worms has always used a variety of landscapes, of costumes, and of weapons. Previous 2d (and 3d) worms games have let you battle it out amongst players in locations as diverse as the moon, "jungle", the wild west, and space. They've let you be anything from an angryscotsworm to frankworm's monster. They've had almost hundreds of weapons to learn to use.
Now imagine that the latest worm game restricts the scenarios available to "space", your costumes to that of a few space themed ones, and replaces all those weapons with a handful for seasoned worms fans to use.
The fact that it gives your experience so little choice or variety feels like a step backwards for the series in my opinion, especially after the latest 3d titles in the worms series, and the excellent handheld versions.
Talking about the handhold versions, the graphics on "a space oddity" look like they've been taken from a psp-sized screen and just upscaled. Now I realise the Wii's strength is not in graphics, but come on! It just looks too much that they haven't taken the time in this department. On both HDTVs and SD tvs the game looks like the developers never bothered seeing what it looked like on an actual console, just assuming it'd all be fine in the end. On an HDTV it's particularly bad, with the menu too small to properly navigate for any length of time.
As the menus (and I do mean ALL of them) require you to use the Wiimote. Entering your team name; requires the wiimote. Selecting a costume; requires the wiimote. By the time you've made your own team your wrist is knackered!
And the game is no less forgiving when it comes to weaponry. Each and every weapon has its own individual set of gestures that require you to waggle the wiimote in a variety of "innovative ways". To be fair, this was expected, and a few of them are quite entertaining (the dynamite in particular). However, for the most part they just create inaccuracy and frustration. A friend took what must have been over a minute to fire a bazooka, usually the simplest weapon in the game to use (to use well, however... is another story)
By that point worms was no longer the fun, easy to pick up party game it used to be, and it didn't take long before it was becoming more annoying than enjoyable to play.
Overall, I would love to have said that Worms' debut on the Wii was a success, but in my opinion it's simply a failed experiment that should never have made the shelves, let alone the price they're asking for it.
I think the Wii's nunchuck and remote control lend themselves perfectly to a 3d worms game (and here's hoping that comes to the wii eventually). In the end though, they clearly felt that a poor shadow of the DS version of worms was all the Wii merited.