People absolutely hate when a character's entire thing revolves around one move. They're usually a low-tier character, and when they aren't low-tier they are just annoying to play against.
the mere presence of the grappler causes a pressure on your decision-making process, since you always have to respect this option from them
but even here, the grappler has more tools than just 'grab you', they have an entire neutral kit still, as well as specials oriented around space control and 'trapping you' in the range where their grab is effective