5* Gulk is he worth it?

I am currently debating on wether or not to take my 5* Gulk to R4. I am definitely going to take him to R3 for V2 and other niche situations (dormammu, starburst etc)
I was wondering though, is he worth taking to R4. At my current position regarding resources etc a R4 5* is basically a 5/65.
I am looking towards act 6.1 completion. Gulk sounds like the best option for 6.1.1 but how useful is he in regards to the rest of the chapter and even act.
So can anyone who has ranked him or even those who haven’t ranked him help me, how much do you use him, how useful is he on a daily basis and why did/didn’t you rank him up
I was wondering though, is he worth taking to R4. At my current position regarding resources etc a R4 5* is basically a 5/65.
I am looking towards act 6.1 completion. Gulk sounds like the best option for 6.1.1 but how useful is he in regards to the rest of the chapter and even act.
So can anyone who has ranked him or even those who haven’t ranked him help me, how much do you use him, how useful is he on a daily basis and why did/didn’t you rank him up
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I found him to be very useful in V2 though so if you have a limited XL roster it’s not a bad choice. Investing in an XL for V2 if you explore is ultimately going to get you 1 R4, 3 2016 R4, 1 R5, 5* AG which is nothing to sniff at.
Also there’s a lot of starburst in Map 6 which he excels at.
He's got some decent utility on top of face me, including poison immunity and heal block off his l1. He does have enervate off his l2, but I don't find it to be all that effective in most scenarios - his l2 is best if you use it at 100 crowd excitement so you get the stun + enervate.
The main problem with ghulk is maintaining his crowd excitement. When it's low he's really not hitting that hard. If you're against aggressive opponents with short special animations it easier to keep up, as he gains some whenever either champ uses a special and when either champ lands an attack. So more punishable specials means higher crowd excitment and more damage. But come up against champs with longer special animations or more passive AI and he struggles with his damage output a lot. And even at 100 excitement he still isn't the hardest hitter (though he isnt a noodle either).
It really comes down to if you think you need his utility or not with your other roster. He's a solid poison immune champ with heal block and a unique ability in face me. I've used him alongside cap IW for a decent amount of act 6, but I wouldn't consider him a staple in my team. I consider him r4 worthy.