He means you can teleport around from the side and thus enter the base from the back.  This is a topic of constant discussion.  I kind of like the fact that it is asymetric and you can sneak into the back of a noob players base.  Capturing the portal itself in the early rounds does little benefit as minotaurs ansd archers are too weak to really do any damage.  It is just annoying.  Late game it can be catastrophic, but that is the case on all the maps.

I've definitely teleported to the dark portal and taken that before, and I tested it and was able to teleport to both sides easily.  I kind of like the idea of having it available, though maybe it is a little too easy.  Maybe put a few more towers nearby so you have to work for it more?

I hate how easy it is to get portal flags.  They should be better defended across all maps.

It would be cool if all portals had a defender. Something like a portal Guardian. Which increases with the war rank. When the enemy destroys the creature it respawns again after 2 summons or x set time. BUT if the enemy captures the portal they can also get a new portal guardian. Each war rank makes him stronger and gives him more health.

I think it makes the end game better. Towers can be easily destroyed late game, and especially portals become important when you get better creeps. So it would be good to have something that increases a lot in power and health.  

I've backdoor'd towers on light and dark side with a warpstone, its very difficult to hold the flags once you take them since the enemy heal crystal is nearby.

@DarkZakurazz holding an enemy portal is rather easy you just need to get in after each 45 seconds and keep locking it. it is really hard to counter this since all you need is 2seconds to lock the flag and you also teleport to the locked flag so there s no way the enemy knows you are comming. all you need to do this is a watch.

Hrm...  Maybe it should be fixed for this map, make it an option for all maps, or do something to the map so a player would know that this is an option.  It'd be pretty to use a tactic like this as it is now because it's one of those "accidental discoveries" that very much feel like an exploit of a map bug. 

Towers are put up by citadel upgrades I believe, but they are also easily solo-able by that point in time, and thus only stalls a small amount. And since you can still lock the flag, with a significant creep upgrade, those towers are dead.

Early game if they take ur portal, doesnt than mean 2x exp for you (or more) and 0 exp for them?

map diversity?

It's only a problem if only 1 side can do it but thats not true, anyone can buy a warpstone.

I think it's a fun tactic. You just need to stay alert if you have lost the center and be ready to teleport back if they try to steal it.

But perhaps some extra towers at the portal would be a good idea anyway, it should never be too easy to steal a portal.

Warp stone, and any warp for that mater, should not beable to bridge gaps.  It is ment as a meens of escape / supprise, not a way to circumvent to mechanics of folowing the flow of trafic.  There are a coule spots on diferent maps this comes into play, but on Crucible it is the most abused.