Really? You know there are certain species of bacteria that can survive in really severe conditions, with high temperatures and pressures present, like those found deep down in a volcano. I wouldn't be surprised if mars is found to have sustained life whether in a previous era or even currently. In fact, I think the way people perceive life is overrated, it's pretty common if just carbon-based lifeforms are taken into account, let alone the other types that likely exist. Didn't nasa reveal like 70 or so other earth like planets the other day?
No, that would not interest me personally. What would interest me is if that alien life was intelligent, and that's a much more unlikely outcome. It's definitely not as common an occurrence as just the presence of life - yet of course still a little probable. But unfortunately, if you briefly look up the fermi paradox and reasons why we have yet to discover other intelligent life, it's quite unlikely that such an eventuality will ever happen :/