I can' t think of much the toylines I missed I did so because they didn't interest me.
I passed on Power Rangers, they had some semi cool zords, but the toyline was 80% boring rangers, 15% villains and 5% zords.
I passed on Thundercats because I had a ton of MOTU and they didn't seem as cool
Could never get into Wrestling.
I wish I had some Pirates of Dark Water, cause those sell for a ton now.
Jace and the wheeled warriors was terrible both the show and the toys and I'm glad I had no idea what they were.
Toxic Crusaders and COPS didn't interest me.
I had a lot of MOTU, I had a lot of Ghostbusters, and a lot of Turtles. I had a bunch of Gobots,
Got a few Sky Commanders, some GI Joe, smaller Dino Riders dinos, Crash Test Dummies, I kinda wanted more than the few Starcom vehicles I had,
Got a few Inhumans and a few Visionaries, a giant carrier for Hot Wheels, and a smaller carrier for Micro machines. My grandma got me some Cabbage patch Dolls, Barbie, My Little Pony, Care Bears, and Smurfs.
I only got 2 or 3 Exo Squad, and I just couldn't get in to it.
I still have a ton of Zoids and Gundams, even though I'm so bored with Zoids now, the recent shows have been terrible.
I didn't get a whole Voltron until the TRU reissue, but it's great and I still have it. Also got the "stealth Voltron"
I missed most of Star Wars, getting the 90s Kenner figures that sucked and going with more until the Clone Wars show when there was just too much to collect.
I only had 7 G1 transformers if we count Defensor as 5, most of the rest I got during or after G2, and I probably have 2500+ now.
I really wish I hadn't collected trading cards. I have so much worthless YuGiOh and Magic now.