I think Telles has been fine so far, especially when you factor in the adapatation to a new team and country. He's clearly very good in a technical sense.
That said, his strengths do make him an odd signing for our 'system' (I'm not sure we actually have a system, but I can't think of another word). We have exactly one forward who has good movement in the box and can attack a cross. We also have no real player who's a genuine scoring threat from crossed set-pieces. Those are literally Telles 1a and 1b strengths.
So, yeah, I like him as a player. Very comfortable in possession...but even when we were first linked it seemed like a very square peg in a very round hole.
A more dynamic, probing full-back like Reguillon would have made a lot, lot more sense on paper.