Likes:
Saint - My red Opto Saint is a staple of my game. Just a workhorse for me, beautifully straight with a little fade. I've had various Gold Lines as well, which for me have flown similarly to the Opto.
XXX - Another staple to my bag. My orange Opto is great for thumbers and for those hard fading shots, getting out of trouble, etc.
Fuse - Such a fun disc for field throwing, working on form. On the course, great for wooded shots and those awkward lies that force you to power down a shot. I'll even occasionally find it useful for certain putts. I have multiple Gold Lines, Optos, and a TM, and always have one bagged.
Suspect - I have a Biofuzion Suspect that has stayed in the bag since I bought it. Love its predictability as a short mid, and have used it as a windy day putter as well.
Judge - They've never been able to replace my Wizards as primary putters, but I still enjoy them. The only putter I've ever been able to drive 300 with. I've thrown Classic Soft, Blend, and Lucid. Definitely recommended for anyone to try.
Others I've liked - Fury, River, Lucid Air Renegade, Pain, Truth
Could definitely put together a solid bag from the "likes" if I ever felt the need to do so (I don't, though)
Dislikes
Stag - I probably didn't give this one much of a chance, once I quickly discovered that this wasn't the stable to overstable fairway driver I was expecting.
Mace - I had a first run GL that I just couldn't get a feel for, and found myself turning it over too easily. Just didn't work for me like Rocs or Ghosts do.
Dagger - I've got a medium. Love the feel. Not digging the results so far, unusually inconsistent in the wind even for a putter, nothing special for me as a driving putter.
Really, the dislikes are more of a personal preference thing, and I really don't think they are bad discs. They just didn't work for me when I tried them.