I feel like I need to go back and replay FFX. I played through the whole game years ago, but I don't really remember anything notable about the battle system. I don't remember it being very difficult either. I feel like I just breezed through the whole game with the same standard FF tactics I've been using for decades. In fact I don't think I even died once...
So when people talk about all these things you had to do I'm just like, huh...sometimes I wonder if I played the same game...
I agree with you. I didn't think X's battle system was all that incredible, I preferred the very similar BoFIV, where your back party takes more of an active role and placement in the front/back had a more strategic element (SP regeneration differs based off of character, so on) than just enemy weaknesses - which was also used in BoFIV. Also, even the enemy weakness bit wasn't a big deal, I found, since you could just use magic most of the time. Wakka, too, was relatively strange, since Tidus could hit most of the enemies that Wakka was "supposed" to be used on.
I also don't think it's very difficult. I see a lot of people claiming to be challenged by a few of the bosses on and after Mt Gagazet, but it was only the normal enemies on Mt. Gagazet itself that were a problem for me my first time through, not the bosses.
From a battle system perspective I'd argue just about everything in X-2 was superior.