Still, Arial isn't poor. It's nearly Helvetica. It's a knockoff, but all it does is simplify some letterforms. It's not like it destroys the spacing or balance or weight or anything. You're talking as if it were Comic Sans...
The only people it might look cheap to are graphic designers. So who cares?
I mean, like you admitted, it's not even a question of aesthetic qualities like the balance of letterforms. You really care about the extra-aesthetic connotations of whether the leg of an uppercase R is straight or squiggly? There are more important things in life. And I say this as someone who cares quite a lot about typography.
Like, sure, Palatino and Optima have strong associations with certain decades that even people who don't follow typography feel subconciously. But Helvetica vs. Arial? C'mon, I don't think so.