Not really very good at all
Some of the interaction between McLane and Zeus was fun, but the direction is just garbage -- almost incoherent by today's standards. Just watch the final few seconds with Simon in the helicopter and tell me that is in any way effective or sensible direction! It's like 5 or 6 quick cuts from different angles which results not in climactic impact, but dizziness. Garbage!
The puzzles Simon gave them were child's play. And of course, this film was a precursor to all the "impossible physics" of innumerable movies that followed -- even the first two Die Hards kept the physics close to reality. The violence in the elevator set a new, low standard for gore. But really, the amateurish direction throughout is just, well, bad