Therion had one more great work in them before they turned into a metal muzak producing unit, While Theli marked the end of their creative progression, Vovin is a solid confirmation of their quality standards. Even though the music is very straightforward, the huge symphonic arrangements, operatic voices and pleasant melodies could easily win over many prog-heads.
While every song is most pleasant, the continuous slow place and generic approach bogs down the effect somewhat. The Wild Hunt is the only up-tempo track that stirs things up a bit. Another weakness is that it is really too sweet and smooth all the way through. It's sure done tastefully, neither kitschy nor excessive (which is quite an achievement in this style), but sometimes I'd really like to kick their butt hoping they would put a bit more adventure in their work.
Therion used to be a unique and ground-breaking metal act in the 90's. Vovin easily proves that. But I used to be more overwhelmed by it at the time it came out. Since then it hasn't survived repeated critical listens all that well, I only play it occasionally now.