The problem isn't so much that countries engage in spying. That's to be expected, really. The problems are in 1) how they go about doing it, 2) whom they're targeting and 3) what data they're collecting.
So if they're 1) using backdoors in consumer products without use of warrants, 2) targeting members of the public without necessarily having good cause to do so and 3) collecting everything they possibly can, then there's a big problem.
Spying on other countries or persons of interest with good cause and/or warrants is what these agencies generally do. What the NSA and GCHQ in particular are doing is far more than this and far more invasive for what seems like little meaningful return and at the risk of their reputations and their respective countries' reputations.