Funny, I would do the exact opposite - completely ignore the ads and look for experiences of the users, reviews or really anything but the ads. How does buying adwords correlate with quality?
If the software company is large enough to afford a marketing team to fill Google up with ads then there's a good chance the software will also have big dollars spent on it.
Contrariwise, if the software you're looking for is already large and complex (driven by the nature of what it needs to do), then ads will mean nothing because they will be expected.
While on the other end of the scale with small purpose-built apps you will deliberately ignore ads since you won't want any bulky bloatware that can afford adspace.
