I've had great luck with
Infiniti. I drove a G37 6MT for 6 years (absolutely loved it) and a QX50 for the past 3 (another great car for what it is). When I discovered the RS400, I was pretty sure it would be my next car.
But then I started to do some digging. You've already noted the steering issue and the outdated tech. But an even bigger turn-off for me is the run-flat tires. They drive terribly, and are susceptible to side-wall failures according to multiple reports. Some of the video reviewers recommended taking them off and replacing them immediately.
By all accounts, the car simply doesn't handle as well as its predecessors with mechanical steering and conventional tires. The power is the big lure but more power with less handling isn't a combination that appeals to me.
So, as much as I wanted to love the
Infiniti (and I do like its looks a lot), it just has too many shortcomings to stay on my consideration list.
I haven't driven a G70 yet, so I'm not sure what I'll think when I do. On paper, it looks like a winner. If I dislike it for some reason, there are other alternatives at the ready. Despite the seeming inconsistency when compared to the G70, the Mustang GT in top trim still intrigues me. It's fast as stink, handles really well, and has a much nicer interior than I expected based on those of a few years ago. No back seat to speak of but I don't care. It also has very good tech with a superb digital dash display, tuneable
exhaust, and lots of other nice little features. The Audi RS5 coupe would cost more but is also intriguing, I'll probably drive one next week. But the Q50 RS400 is pretty much off the list at this point.
I'm not trying to persuade anybody one way or another but just sharing my individual perspective.