I guess peoples' interpretation of "better" is completely aesthetic and contingent on their taste? I can respect that some people would choose LD or MD content, seems like low ploy / low resolution models work the best for an engine that was designed for such use.
In any case, I don't know of any Blue Shift Dreamcast pack. Best bet is to private message the creators of the mod Thomas mentioned, I'm sure they could point you in the right direction.
http://www.moddb.com/mods/half-life-dreamcastIf not, you could simply re-rig the Dreamcast models included in the above mod to work for Blue Shift. You'd have to be a little creative for things like dead_barney or rosenburg's head mesh... but yeah. Modding should only really be done if it's fun, once that stops there's not much incentive.