The harem and fanservice in this anime is cliche, and personally, I found it cringingly loveable in that respect. I couldn't help but laugh when your typical fanservice scenes came up, made even more classic by a clueless main character.
The combat system of the Blazes is actually really interesting, and it's actually quite a shame that this is a short series, because the premise of Blazes could make for a great battle-series.
Speaking of which, even though it is mostly a harem/fanservice anime, it does have some nice fight scenes which came as a bit of a surprise to me.
I think it's definitely worth the watch if you're a fan of cliche harem and fanservice.