how good will be to buy a second hand 2.0 capacity Subaru impreza?
For what purpose?
Assuming you NEED a compact all-wheel drive vehicle, much depends how the vehicle has been treated and maintained.
Personally, I would not buy any second-hand Subaru unless I personally knew the owner and the car had been maintained by the book!
A used Subaru is full of potential hazards.
Most of here strongly suggest taking a used car to your mechanic for a pre-purchase inspection. It’ll cost about one hour of labor, but you can avoid many (but not all) expensive problems that way.
I am looking at a used 2011 Subaru Impreza should I be concerned ?
That is what you should ask.
Now I agree with Mr. Docnick. Any used all wheel drive vehicle could be a costly vehicle and there is not a one size all answer for any brand of used vehicle. Spend the money to have a mechanic look it over and see if you can get service record for it.
However, that inspection will not reveal whether the car’s tires were consistently rotated on schedule. Failure to rotate the tires on a fairly precise schedule, and/or if the car was ever run with mismatched tires, means that the Center Viscous Coupler is like a ticking time bomb waiting to explode in the new owner’s wallet.
I am a long-term very satisfied Subaru owner (I am currently driving my third Outback), but I maintain my cars flawlessly. That cannot be said for a fairly large percentage of car owners, and even though I really like Subarus, I would hesitate to buy a used one, simply because it might not have had proper maintenance.
The 2011 Impreza rates overall average for reliability, says Consumer Reports 2018 April [Annual Car] issue. The worse than average areas are Engine, Major; Paint/Trim; and Noises/Leaks. The one area much worse than average is Brakes. 2011 was the last year before a major redesign of the Impreza. The 2012 and 2013 also are rated average reliability. The prediction for the 2018 model is worse than average.
Unless AWD is a strongly-desired feature, you could do better with a simpler and more reliable FWD car. If you find you need better performance on snow and ice, get winter tires on steel rims for your FWD car. And if you stay away from Subaru, and maintain your new car well, you almost entirely eliminate the possibility of an expensive head gasket leak - which in a Subaru means two heads, not one, to repair.
One quick check, use a tire depth gauge to check tread depth on all 4 tires. They should all match within 2/32, 1/32 preferred. But still get an independent mechanic to check it over if it passes that test.