Hello.
Probably better for the mage forum, but the distaste for frostbite is that its DOT damage is poor compared to incinerate and it's DPS damage (which hits with cast) is also poor.
Frostbite DOES hit at cast - for several thousand damage at high lvl
The only time Frostbite becomes usefull (for an ice mage which wants to max its DPS) is at very high level, when it becomes possibly one of the the most usefull skills as it is one of the only ways to increase your DPS (only AFTER you have maxed everything else)
Currently my skill points are as follows:
50 frostbite
50 ice shards
50 ice blast
49 ice attune
40 ice lure
40 eshield
_______
5 cloak of fire (dl gloves lol)
5 eboost (dl armour)
5 cloak fire (dl armour)
for a total of: 294 skill points (or 296 with hrung helm - but lose DL set bonus)
Items:
rings: royal attune (+5) / grand attune (+4) / 2x (+7+7 shield/bite) (interchangable with spiritseed set)
+12 shards skull
+5 dragonlord ice blast helm (interchangable with +7 shards hrung helm)
+5 dragonlord skirt eshield
So to the OP, at level 58, frostbite will
not be the best choice for your build at this stage
However, assuming it will be possible to reach lvl 210, and max skills go up to 45/50, it is theoretically possible to have all your DPS ice skills at level 50 which would be a quite nice build
Hope that helps,
chop