Being flammable, I've found the next to useless really. The damage if set afire is inconsequential, and at higher levels the damage will be meaningless. Their effects simply don't get a chance to provide their intended purpose: to provide either advantage to melee attacks, or in the case of Web advantage to melee or ranged attackers.
But even if they weren't set afire, their duration has been nerfed by 80%, and any difficult terrain they might impose is quickly ignored by enemy units that have almost unnatural jumping ability. They simply hop out unless they've been rendered prone or enwebbed. Web has been further nerfed by not robbing the enwebbed enemy's action to save out, the save happens automatically.
All in all, two classic spells, rendered largely useless.
