Molotovs should burn hotter/faster or create a bigger fire to make them better as a nuisance tactic.
Ethicol bombs rigged to entrances should spread fire and explode on both sides of the door they are connected too.
Pipe Bombs should cause a short stun and deafness period. But not an unconsciousness effect.
Any impact(Non fire causing) based explosive should share this effect.
Give shrapnel from frags a chance of damaging or disabling individual pieces of chrome temporarily.
Most other nades are pretty good or bordering on broken in terms of powerlevel for their role and utility, or I haven't experienced them enough to rationalize a suggestion for them. But there's some suggestions for making explosives feel boomier and be a bit better of an edge in combat.