8) 2005-08 Topps Barry Bonds Home Run History
Fresh on the heels of the Mickey Mantle Mirror Monstrosity that no one wanted, Topps decides it would be a brilliant idea to make an even BIGGER set with a player who is more loathed than loved.
9) Allen & Ginter Rip Cards
Allen & Ginter hit the hobby in 2006 like a ton of bricks. Great looking cards, awesome inserts, autogamers galore... and these things. A rip off (pun intended) of 1998 Zenith "Dear To Tear" cards, these low numbered inserts could be left minty fresh or could be shredded to get what was most likely an extended series mini card. Don't count on an autograph or sketch card, dealers could pick those out quite easily with a flashlight before putting the rest on eBay.
7) 1998-2000 Topps TEK
This super premium release from Topps was a 90 card set... with each card having 90 different variations. That's an 8100 card set for all you completists out there. But wait, there's more! Each card and variation had a Diffraction parallel version! The 1999 and 2000 versions had their checklists cut in half with less variations but were no less confusing.
10) 2007 Topps Generation Now
Another entry into Topps Mirror-crazed inserts from the late '90s, Generation Now took a good idea (featuring young up-and-coming stars) and screwed it all up with a ton of cards that looked all alike. Player collectors had to deal with tracking down a few dozen cards of David Wright or Curtis Granderson while people who just didn't care ended up with a bunch of cards that were all the same save the number of steals or doubles. To add insult to injury, Topps did the set the right way as bonus rookie cards in K-Mart blasters.
Vote for the worst over on the sidebar and may the lousiest gimmick win!