Really there is such a large variety of anime out there and tastes is going to be a big part any anyone rating there are plenty of shows out there that just aren't for everyone. For instance I've watched shows about cross dimensional robot fighters, fighting empty soda can girls, zombie killing chainsaw wielding maid magicians, teens fighting tournament style in convenient stores for reduced priced lunches, highschoolers with parasitic alien arms, shows with every type of harem imaginable

and etc. Hell my favorite anime this season is essentially about orgasm inducing cooking and while I never expected to be into something like that I'm loving the shows energy and characters

.
There are plenty of shows that turn me off though. For instance slice of life and sports anime there are a few exceptions out there, but for the most part I can not stand those genres. They just bore the hell out of me and/or feel extremely awkward at times. I can see there being plenty of audiences for them and many of them may be very well written and animated, but I just can't stand them

.
On a side note I'm very tempted to do what I did in college again and start watching every anime on my favorite fan subbing site in alphabetical order. Really ends up giving you a lot of variety and opening you up to new things. Of course I let myself skip stuff after 2-3 episodes if I don't find it entertaining. Last time I did it I made it to around the B section but that was years ago on a pretty small site maybe got around 30 shows down and skipped 10+ ended up finding alot of series I enjoyed that I otherwise might have never watched though for instance Aa! Megami-sama(Ah my goddess), Amaenaideyo!!(Ah My Buddha

), Angel Heart, Airblade, and a few others.