And lancers can't ride you over and stab you in one go because the lance is too long for that.
You can bump-stab people with lance, just it takes 3-5 bump-stabs to kill someone so it's not really used.
Lancers are at serious disadvantage in 1 vs 1, mostly because 1 attack direction is just screaming for someone to chamber you, and you can't do crap against aware infantry man.
On pub games, lancers are OP since it's easy to circle around and pick off stragglers which don't have a bullet ready, but that mostly has to do with low skill levels and lack of situational awareness in pub games, rather than lancers being inherently OP. If you don't get shot down, heavy cavalry is even more ridiculous (outreaching bayonets, then tanking hits while dismounted, all the while slashing with your 1 hit kill sword which on swing has 10 range less than bayo, or outreaches it on stabs
)
Anyway, if lancers were to be nerfed, just dropping their riding skill a point or two will result with them being much easier targets.