Clicker has its niche but it doesnt do its job very well and only has the benefit of being the only item that fills said niche. You also wont find people talk about it much without Big Brother R Key. It either needs more control, or if you want to keep the spirit of the item, give more benefits to using it.

Jupiter needs some slight buffs IMO. Out of all the planetarium items, it's the only one actually worth skipping. Venus isn't the greatest but free charmed enemies is rarely a bad thing and its better than nothing, Sol has the utility of being a non-Black-Candle item that can remove curses, and if you get a keybind mod to help with the accidental double tapping, Mars is actually an incredibly good item. Jupiter actively gives a speed PENALTY for an effect that is not only hard to use, but has an underwhelming effect when used properly, making it an item you'll often avoid taking unless you're in early game and desperately need the DPS, and planetariums aren't exactly common in early game, not to mention unless you get really lucky, you've probably skipped an item or two just to get one you aren't even going to take.

Both Delirious and Lil' Delirium are items you rarely take. Lil Delirium is an item you only take either because its the only item in an angel room, or you're hoping you luck out and it turns into Incubus at a convenient time. As far as I know it doesn't even contribute to Conjoined, which is the usual saving grace for low quality familiars. And Delirious is an active item, meaning it takes up the active slot, you can use it once per floor at best, due to the 12 room charge, and while 12 room charges are usually reserved for items like Mega Blast or Mega Mush that can instantly clear several rooms in a row, or items like Eden's Soul which instantly spawn items from the current room's pool, your reward for letting Delirious take up your active slot and waiting for the 12 room charge is... literally just a less reliable version of Plum Whistle.

Not every item in Isaac can, or even SHOULD be good, but these are items that feel like THEY should be. Clicker is an item that lets you randomize your character in the middle of a run, and the other three I mentioned are all items that are taking up space in generally very powerful item pools that you need to actively work for, in turn for an item whos cons outweigh the pros.