I personally just really dont like all cav. I dunno I just feel dirty using it :P

But seriously, I think its important to have some sort of anvil for your cav spam hammer. I've noticed many of the good players when cav spamming at least get some peasants, just so say hold up enemy infantry. I think whats making Moors so popular is the sudanese tribes man, and also factions like france/scots with cheap pikes.