I tend not to view 180k as very high miles before an engine gives up. For me, there have to be numerous examples that see 300-500k miles before I consider it a reliable engine (See my sig). My pizza delivery truck (since new) has 312,000 miles and 180psi of compression on all 4 cylinders and has not had so much as a single sensor failure in 10 years. Yes, the OE clutch gave up at 200k, the original water pump only lasted 190k, and the original starter went at around 270k, but all in all it has been a fairly reliable vehicle. I fully expect to see 400K+ before the original engine ever needs to be removed from the truck. However, this is a very common experience with KA24E and KA24DE powered Nissan D21 (Hardbody) and D22 (Frontier) pickups, not an anomaly like ANYTHING with a Quad 4.
BTW, the Quad 4's second generation (they stopped using the Quad 4 name because it was so tarnished) was installed in the Cavalier Z-24 after the 1995 restyle of the aging J body platform. It was only replaced with the Ecotec in 2002 or 2003. The problem was that GM products of this era were not competitive with their Japanese counterparts in handling, build quality or reliability. I have had 2 Sentras from the 1990's, and compared to a Cavalier from 2003 they were far better cars in terms of build quality. I knew someone who had a new one in 2002 and could not believe how awful it was. The interior reeked of Chevette like cheapness and the panel fit was very poor. The switches, stereo, etc. felt like they were made in a Soviet car factory, not a product of a first rate company.