I give this album 4 stars because it was only the start of them. Listening to this album and then listening to lateralus will greatly show you how they have evolved musically and lyrically. But overall, this was a great album for it's time. Tool stepped on to the scene showing that they had uniquesness and creative music. They just hadn't perfected themselves yet. If you wanna hear a young maynard just starting off and good music that was only gonna get better, then this is the album for you. Undertow was in the same era. I think Aenima was the album that made fans turn heads and raise an eyebrow. That was the album of change and when Tool figured out where they were going musically. Aenima officially and completely separated Tool from other bands. Opiate was just the beginning.