If you really must use one in combat then take a good pike and use that while mounted instead. You can still use the webs but can do considerably more damage. (And don't put any levels into melee, a high level spider still only does about 20 damage per bite. Useless.)
After the creatures replaced this many considered it useless now.to re-new this it would be nice if it had a full power climb,like megalania,maybe hav it be able to spin webs to trap creatures no-larger than a carno,to top it all off hav it spin webs around your base that produce silk and when wild dinos try to attack they get caught in the web.thumbs up if u agree.
Don't underestimate this creature in PvP. A webbed player is effectively blind. You can also use the webs for taming, similarly to the moth in Scorched Earth, by shooting webs onto a Dino and blasting them with tranq arrows and darts before they can run away/fight back.