That is why you need to set all games on Hard.
I do believe it was on hard.
I kind of like the really punishing but fair shooters the best. Take Image Fight. Sure, it's not the prettiest game out there, but it plays like a dream. It rewards good strategy and positioning, and punishes laziness. It's a great, underappreciated shooter. Aero Blasters is like that. R-Type is too. I tend to like those kinds of shooters the best. Gate of Thunder is nowhere close to the difficulty of Image Fight.
Now, that said, it makes up for a LOT by presentation, music and the rest. It's a mite easy, but it's damn fun, and the overall result is an A-list game that is really, really entertaining and a great way to show off the PCE to someone whose never played it. Lords of Thunder is great too, and I find, a bit tougher. Usually that would make me like it better, but I like the visual presentation of GoT better.
But really, it's like comparing a luxury sports car to another luxury sports car. The differences are minor. They're both awesome.