Genre is not the same as quality, and influential is not the same as good.
5 stars = Legendary. An absolute classic, a true pinnacle of it's respective style, it has me enthralled from start to finish. I'll return to it over and over, and keep on finding more to appreciate.
4.5 stars = Brilliant. More or less succeeds perfectly, only lacking in that extra special something to make it truly legendary.
4 stars = Good. A good, solid album. The odd problem/duff track, but only to be expected. Really enjoyable all round, well worth a go.
3.5 stars = Decent. Has some issues holding it back, with the flaws being bigger/more apparent than a 4-star. Still decent and worthwhile if you're a fan of the band/genre, but there are better.
3 stars = Mediocre. Has it's moments and good songs, but I have little desire to go back to it. Ultimately forgettable, being neither particularly good nor bad.
2.5 stars = Weak. The crap starting to outweigh the good now, serves little real purpose. Has some nice points here and there, but plenty of rubbish too.
2 stars = Poor. Maybe a handful of good moments/aspects in the whole thing. A definite let-down from any reasonable band.
1.5 stars = Terrible. Hardly any saving graces. Even if it isn't genuinely offensive there's nothing of real worth either.
1 star = Crap. A terrible excuse for an album which I had to force myself to get through. Worthless.
0.5 stars = Atrocious. An insult to music, barely even qualifies as listenable. Something has to be fundamentally wrong with the artist to warrant this score.