"a huge plus" is correct and usable in written English. You can use it to mean every advantage or benefit that is large or significant. For example, "Having a diverse portfolio of clients is a huge plus for any business.".
"That there's no football at Creighton is a huge plus".
But it's a huge plus for the show and for the network".
"It's a huge plus to be where we are," he said.
Mr Clyburn's endorsement would be a huge plus for anyone lucky enough to receive it.
The cork handle is a huge plus: the lack of water gauge, a huge minus.
"Having Spencer back is a huge plus for us," Princeton Coach John Thompson said.
It would be a huge plus for those mothers opting to breastfeed, because the recipient is merely a corridor away.
Being a terminologist, I care about word choice. Ludwig simply helps me pick the best words for any translation. Five stars!
Maria Pia Montoro
Terminologist and Q/A Analyst @ Translation Centre for the Bodies of the European Union