I went with last years set. Surprise, surprise, the guy who likes robots picked the set with the BATs in it.

'02 Crimson Strike Team - Mike T must be right aobut being first, because I never understood the appeal of these particular figures. I think the misconception of these being popular is what led to the overdone Crimson stuff that followed.
'03 Operation Anaconda - I really like the swamp vipers. At the time I really liked the whole set. Now, not nearly as much. The attendee Fireflys are nifty though. And they also had the best parachute figure by using the Vapor mold.
'04 Dreadnok Rampage - I don't care what other people say. thsi was a solid set. I don't partiuclarly care for the dreadheads but they aren't the worst thing to come along either. However, if they could have made Torch and put Zanzibar and Thrasher in the set we could have lived without the dreadheds all together. I also really like the Joes in this set. They aren't anything you'd find anywhere else. The additional attendee figures aren't worth picking up. While the zartan is neat for about 5 seconds, it sat in a drawer after I got home from Orlando.
'05 General Mayhem: M.A.R.S. Invades - I really liked the Iron Anvils and Metal Head. Both were molds that needed a arepaint and I'm happy they got one. The rest of the set did nothing for me. General Mayhem made me wonder why we didn't just get a Gnawgahyde the year before. BEst attendee figures so far. Just fantastic with Mega MArine Gung Ho, Steel Brigade, and Dragonsky. Fantastic paint apps and details.
'06 Cobra's Most Wanted: Mercenaries - Again, I like this set. Best Major Bludd ever. Decent Overlord. Cobra Mortal looks at least as good as the original, but I do wish they would have chosen a more inovative mold. I do agree with Mike T that the Coil really don't live up to my own expectations. They could have done better. I skipped the MArauders, but snagged the Ferrets.
'07 Tanks for the Memories - I didn't care for the skank vipers but the rest of the rest was so full of win I didn't care. Great set. If they could have gotten the tanks made for thsi it might have been the best all around set ever. Still the attendee Starduster and Grandslam figures aren't bad at all. Plus Hot Rod Rowdy Piper which was a pretty neat figure.
'08 Cobra Headhunters - BATs, Headhunters, and Headhunter Storm Troopers. Nothing else needs to be said. Add in Hotwire and the Joe SWAT team for the attendees and you have the actual best all around set.