I think it was a smart move on the part of the Russos, film writers, et al. to draw from various depictions of Thanos in the comics, and let's be honest: modern takes on the character haven't all been lacking. I personally enjoyed how he was used in Hickman's "Infinity" limited series as well as his run on New Avengers. It's a shame the guy no longer works for Marvel because he's one of the best writers in the business.
Moreover, surrounding Thanos with formidable allies like Corvus Glaive and Proxima Midnight doesn't make him any less cunning in my eyes. If anything, it speaks to his leadership prowess that he's capable of managing such an imposing and disparate group of individuals. Their inclusion also serves a secondary role (provided that they're portrayed as fully formed, three-dimensional characters), as it brings a slightly new dimension to the tired ensemble hero vs CGI villain dynamic. I could be wrong, but I suspect that audiences respond a little better to larger than life characters who aren't loners (e.g., JL's Steppenwolf).
We'll see, though.