I admit that nostalgia probably plays a part in my rating for this one, but it's pretty good on its own.
The real strength of the storyline is the cool fights we get to see. We get a good Bullseye/Cap battle, as well as a good Cap/Daredevil fight. Come to think of it, this thing is loaded with cool fights. Red Skull/Kingpin, Crossbones/Bullseye, Cap/Crossbones, even Diamondback/Black Widow.
The late, great Mark Gruenwald did a good job here of throwing in plenty of action but still maintaining a good plot. This was published in 1990, and only a few years later, the cool plots were harder to find and the mindless battles were endless (and at times boring.)
Cap gets drugged and is acting like a lunatic through some of this one, and Gruenwald did a good job of putting characters like the Red Skull and Bullseye into a street level crime type story. (If only The Punisher had shown up, this would have really been perfect.)
The Ron Lim artwork isn't quite as good as he became just a few years later, but it was still exceptional.
Overall I think is is somewhat of a hidden gem, and I highly recommend it.