Don't think anyone is gonna read this but my rating system for TV Series (OVAs are excluded from this system, as I rate them how the fuck I want) goes something like this.
Tier 0: Once in a lifetime type of series. (10/10)
Tier 1: Excellent series that I would recommend to anyone, beyond the genres. (9/10)
Tier 2: Really good series within their genres that were satisfying from start to finish and should be mentioned among the best in their respective genres. (High 8/10)
Tier 3: Really good excersises in a certain genre that are enjoyable from start to finish and have a mid-to-high replay value, but might just not bring anything new to the table for a that genre. (Low 8/10)
Tier 4: Decent-to-good shows with low replay value that were mostly enjoyable while watching them, but then were forgotten. (7/10)
Tier 5: Decent series that are kept from upper tiers because of a fatal flaw, generally a botched ending to the series or a bad pace. (6/10)
Tier 6: Below average shows that I shouldn't have finished and that I'll never revisit. (5/10 and below)