The Worms games are fun, but they've about reached the limit of what they can do with them. This is the second handheld version (the first one came out only a year ago). Could be a fun portable game. IGN seems to be the only ones who rated it, and they gave it an 87%.
Upgrading the PS3 hard drive is pretty easy. Most of the older systems make it easy to format and restore your firmware, but some of the more recent systems require you to have the latest firmware on a flash drive. Here's the guide I used: http://www.