I wouldn't say it's the most appealing. It's just the most simple, universal, sans-serif font. (Times is probably the serif equivalent.)
Medium Helvetica is super legible and has great proportions. It gets out of the way and lets you concentrate on the content, which is why it's used for things like subway signs. It's kerning is balanced and works at large and small sizes.
Helvetica is kind of like denim. It doesn't go out of style, but you can wear it hundreds of different ways.
It's also Swiss. They generally make good stuff. :)
Medium Helvetica is super legible and has great proportions. It gets out of the way and lets you concentrate on the content, which is why it's used for things like subway signs. It's kerning is balanced and works at large and small sizes.
Helvetica is kind of like denim. It doesn't go out of style, but you can wear it hundreds of different ways.
It's also Swiss. They generally make good stuff. :)