FactPile » We are the 10% - Daily debates about Comics, Movies & Video Games.
If you pick the right threads people actually talk of the feasibility of things like this, armors, weapons, nukes, everything is looked at very carefully, calculations are made, and battle situations are created and tested out.
Since you and I at this point are arguing about a fictional yet possible battle in the future between a slightly or (depending on when we meet them) extremely advanced humanity and an alien species you may as well duke it out with people on a forum website that is much much more specialized at this particular kind of debating, if not, ignorance is bliss my friend.
As for being fancy? No need to be fancy when you have a weapon that can level miles of land on end with the energy of millions of tons of TNT.
Explosions are also quick and hard to spot in space if we get in to the realm of space warfare. Unless they spot the tiny carriage for the warheads a detonation in space is determined to be an extremely quick flash and then nothing (due to the conditions of space as compared to planets with our atmosphere or an atmosphere in general). Nukes are much more deadly in space than anywhere else, and if humans ever met aliens the biggest and most important battle will always be space, not planets, for many reasons.