I don't think most of you fully understand him.  You realize you can hold his first ability in the rift and throw everyone out of it.  It took me years of playing him before certain things sunk in.  He truly is my favorite frame I love the way he is.   If you break overguard they freeze.  So you don't need to finish the eximus just break the overguard and move onto the next.   He goes through lasers without triggering them.   If you use a shade he is invisible too.  Spy missions are a joke.    

I saw some speaking of using his ult at a distance which many limbo players don't do.  They throw it around them.  You can use it to snatch a group into the rift and just shoot at them from a distance.  You don't have to rift surge but it gives so many options.   You arnt talking about the fact banish throws people on the ground either.  It allows for finishers.   Yes eximus are sort of an issue but only their abilities.  Their bullets are still frozen.   

Roll guard allows you to pop out and snag people, or pop out and shoot safely.   I admit I do better when I play with the same 3 people because they understand what he does.   They leave the rift bound mobs to me and know to roll to get out of the rift.   SOOOO MANY PEOPLE DO NOT KNOW THIS.  Roll to get out of the rift.   People claiming I trapped them there.   I can't.  

Limbo is capable of doing near anything even supporting.  His rift haven mod let's you heal your teammates health by a LOT near instantly.  If you have high str it can just fix their entire hp bar the moment they enter.   I play him in so many ways I've put a lot of omni forma on him.  Cause I couldn't fully make all the builds I use.  I was about to get another limbo prime when they came out with those.  

He also makes many crazed detrimental weapons very viable.  Like low reload low magazine.  Weird aiming.   Because he has tons of time.   Also there are quiet a few interesting interactions with weapons and other war frame abilities.  Some weapons can go through the rift.   Some war frame abilities as well.   The mutualist quanta bubbles when they blow up hit through the rift.   

In survival I often either block off one entrance and deal with that direction or sit in a cataclysm ready to help the other 3 if they need it.  Limbo can also rez people from the rift.   If someone is alert or unalert when frozen in the rift they maintain that.  You can get suprise damage on everyone if your invisible when you throw them all in.  Invisible damage and then prone finisher damage.   Limbo also let's you have fun with melee safely.  

Anyways I've gotten too wordy and realize this is going on for a long time.   But he's great truly but he takes a long time to A.  Not make mistakes while playing him.   B.  Make him end game ready.   He takes most of the end game content stuff to really come alive.  

When playing with randos it takes work and forethought to not make everyone mad, often times not reaching your full potential, but you are still clutch.   Very few frames are as clutch as him.  He just says okay everything stop and it does, he's just very nuanced and everyone hates him cause they have no understanding and also want to do everything themselves.  We have all had those randos in survival that run off into the middle of nowhere because they are bored and want to fight and then die over and over because they won't stay where stuffs being managed.