It's a fairly simple and incredibly fast game. No real stacking, not deep but a tough "player's" game that requires you to make all shots on the pf to do well.
I disagree strongly with your comment of 'unbalanced' scoring. The scoring is among the MOST balanced of any modern game. No 17-gazillion-point mega-jackpot shot here. 5 modes that have to be started and then completed (several timed) and one 3-lock mb. If you finish a mode you get 1M points plus what you earn in the mode. And, there is not a single common shot shared between any two of the 5 modes! So you need to finish 2-3 modes to get a solid score--not easy. The mb gives jackpots for ramps, then orbits, then a tough inner loop with variable value. No mega-stacking secret-strategy shortcut to huge points here; you have to earn the points mode by mode, and that requires accuracy.
When clean, this game is ridiculously fast. Seasoned players really like it here. Tough but fair game. I've had one since I got it NIB in '98, so I know it well.