Hmm, the best i can answer you, is that i will speak about 2 megadrive games with arcade quality.
First Alien Soldier, yes it is arcade quality, overall design is successful, it is nervous.
Yes, overall control requires training , but my main complaint is about this boss rush system.
It doesn't amuse me, to me bosses have to be reward after a good stage of side-scroller with a good level-design.
And to me, it is all about atmosphere and variety. For example, on gunstar heroes, there is a rush boss mode but it is after several stages of side-scrolling and also is justified by the script : the dice game. Yes, dice game is a good idea, according to the parties, you never encounter the same opponent twice thanks to random dice.
Yes, unbalance Alien soldier to me because of game system that is not my cup of tea.
Seconde game, Batman and robin, why it is a difficult game ?
It could have been a masterpiece, but theses bosses and this plane stage are too long and too repetitive.
Even by cheating with invincibility, it is too long.
Batman and robin, huge technical performance, in each stage, megadrive is pushing at its limits, but unbalance difficulty ruin all the game.

