。
I think that's interesting.
Literal
Interesting-like [at-に] thinks.
面白い + ように ('in an interesting way, as if interesting') + 思う. ~ように思う is the frame 'think as if, have the impression that, seem to' — a hedged way of expressing an opinion. A bit stiffer than the plain ~と思う, and worth remembering for essay or formal writing.