Note: of course to use Andronikos you need to understand how to use a ranged dps, but that shouldn't really be a problem.
Yeah, I'm kind of shocked at how few people I see running around with RDPS companions. I use them on every single toon of mine that isn't themselves an RDPS. I've spent a lot of quality time with Andronikos, Risha, Gault, Vette and (my personal favourite) Zenith.
I wouldn't suggest Andronikos gets the spotlight next, though he is a worthy contender. That honour should go to my personal favourite compaion, Zenith.