I'm not very well articulated in the Naruto-verse. But its just that...you have Sharingan being so hyped up in part 1, then its original abilities took a back seat to Mangekyou abilities.
I mean even in the heat of battle, clan vs clan, Uchihas should be able to predict OR counter moves, and cast varying levels of genjutsu. For example Senju with a sword is about to do a basic slash, Uchiha easily sees this, blocks, then counters. Said Senju has no way of blocking.
It just seems weird that the Uchiha clan was "easily" (note the quotations) subdued, and that Tobirama killed Izuna (who had MS).
I mean even in the heat of battle, clan vs clan, Uchihas should be able to predict OR counter moves, and cast varying levels of genjutsu. For example Senju with a sword is about to do a basic slash, Uchiha easily sees this, blocks, then counters. Said Senju has no way of blocking.
It just seems weird that the Uchiha clan was "easily" (note the quotations) subdued, and that Tobirama killed Izuna (who had MS).