I agree with you in some respect, but I also feel that there is a limit and for the most part, in my opinion, Blackpool goes beyond the limit of crappiness. Some of their wooden coasters are brilliant coasters, but a lot of them have fallen into varying degrees of disrepair. It's just in general not a particularly nice place to be.
I was at Alton Towers today, and often get that sort of feeling, that you were talking about, I find myself walking and thinking that they have some good rides, but when I think about it for the most part they are too... "clinical" I guess. The only few rides that I think actually fit in there nicely and are well bedded in are Nemesis, The Runaway Minetrain and The River Rapids... actually Oblivion is begining to age quite nicely into it's surroundings also, but what I'm trying to say is that it can feel like the rest of the parks lacks feeling and history.