Maxperson
Morkus from Orkus
On the other hand, there are quite a few subpar or even trash low level spells in 5E that it makes one wonder. Did anyone even review or playtest those spells? Charm Person being one example of subpar, Witch Bolt an example of trash. Like you mentioned with Tasha's, both of these spells can be awesome given the proper circumstances. Unfortunately, the proper circumstances tend to be so few and far between that many players will almost never prep them. Even Tasha's which is considered a great spell in most of the wizard's guides is mostly limited to combat scenarios. Use it out of combat and at best it's a distraction because it mostly just annoys an NPC since they bust out of the spell so quickly (in non-combat terms). And solo foes in combat tend to bust out of it even faster. It really isn't that good of a spell at very low level compared to Sleep which has way more control (until levels where Sleep finally peters out and Tasha's becomes better) except for less frequent situations against foes with a lot of hit points.
I have a theory that this is deliberate. WotC has a history of doing this with MtG. They make crappy cards in order to make the good cards stand out, because if every card is good, nothing is really good and good becomes the new average. They may be using the same philosophy with spells.