I think Pac's Grab is... kind of unusual, which explains it's perks and weaknesses. While it's slow and easy to punish, it has also interesting attributes to these things being able to punish spotdodges and having extended time that can be used to punish certain approaches or even landings, and even pressure if you have a momentum in certain situation.
Unwieldy would be best word for this grab, for it's not certainly useless and has it's unique advantages, but shouldn't be used like a regular tether in order to know those things.
Villager and Robin IMO have still worse grabs compared to Pac.