The game is awesome, we can all agree on that, but what's the worst/your least favourite thing about it? My least fave thing, apart from the fact that it ended, is that there's not so much to do in the zones. There's a lot of buildings there, but you can't access them. I think that it would be cool if there were a extra little game in every zone or something.
Also, the fact that they reused music in some games, for example Webley and Tank have the same music in their games.
Some games to me feel really lack luster, Tank's game for example. But there are some good games I love Rock 'em sock 'em sprocket, Funkey Fighters, Fish Bowling, Bones Fishing Hole, the list goes on.
The Figures albeit annoying to work it was still revolutionary at the time, and it has been improved over these years. Just look at Skylanders and Amiibos where you put them near the NFC chip and it works, no readjusting required. Plus nothing some rubbing alcohol and a q-tip won't fix.
I'd say the most annoying thing is that what you can do is restricted by the Funkeys you own. I love Skylanders, more than a person aught to but in Skylanders you can play the entire game with one character, in Funkeys to complete the story you need to buy each character and do really well in their respective games. If you don't have a character to that place, you can't get in, I have never set foot into Speed Racer's area and I've never seen it until the 25th of August in 2014 where some Youtubers did a series on it!