No matter what, every car has it's issues, so relying on google is not always a good thing. Yes, it's good to see what others have to say about the vehicle, but keep in mind that every vehicle is different and you should judge the vehicle by what you see cosmetically/mechanically.
It's not a dealer's intention to sell you a lemon, they wouldn't last very long if they did so purposely. It is however a part of the business and that's the risk you take buying a used vehicle. S*** happens!
What makes the difference is how far a dealer is willing to go to help you address those issues.
Ok perhaps I should have been clearer... I was using google as an example though I have found it helpful... I know for example my car is notorious for electrical issues... low and behold I get random internal lights flickering...
I am mearly saying to not rely on just someone elses word but also know more about what it is you are buying. Its like a bike... make sure it suits your needs, make sure it has no recalls or if it does have they been done or is it something you can bring in yourself. (btw that lemon I had... had the worst recall.... brake failure... guess how I found out....also the recall had a deadline on it... which was before I bought it, $1800 later, stupid me should have done my research)
Its a lot of money to just toss in and end up a couple months later cursing your choice.
My research for example is to
A: look up on google... get a basic list of a couple cars I am looking for...
B: compare gas milage, parts and potiential repair costs - is it gonna cost $1000 for new tires for example
C: Look for known issues, recalls etc. Potential issues. Are they issues I can deal with?
D: Talk to car fanatic friends, if I can a couple people who deal/work with cars
E: Talk to my mechanic
F: (used) Look at the car, take it for a drive that includes highway, look for signs of abuse and also ask for any maintance records
If its down to a couple choices on a lot... I skip part A and run thru the rest.