Jinder Mahal and it's not even remotely close. Jinder Mahal may very well go down as the worst WWE Champion in history and that's something that will only be exacerbated if the title is kept on him all the way to WrestleMania.
That's not to say that Lesnar's run doesn't have faults, because it most certainly does, but there are redeeming values that Lesnar has that Jinder simply doesn't. Lesnar has credibility that was built from nearly 2 years in WWE from 2002-2004 and while he wasn't there for long, he left a major mark on the company that had a lot of people talking about him long after he left, a lot never even stopped talking about him, because Lesnar was a genuine freak of nature in those days. It wasn't just that Lesnar was so dominant, it's that he was so dominant and put on so many fantastic matches with so many different opponents. Lesnar was probably the physical embodiment of the perfect professional wrestler in Vince McMahon's eyes. Want proof? Brock Lesnar became the WWE Champion for the very first time 3 months to day of his television debut. Lesnar was big, he was strong, he was athletic, he had an amazing look and was a genuine marvel to behold really. Lesnar's problem was that the guy had no heart, no real passion for wrestling; he loved all the money he was making but wasn't at all happy about the fact that he was having to work his ass off for every penny he got. I think that he believed that it'd be a cake walk, that, like many other athletes before him, pro wrestling would be easy money only to find out the opposite.
When it comes to Jinder Mahal, there's simply nothing there. Jinder is only WWE Champion because Vince McMahon hopes that it will help lead to WWE expanding its audience into India. Jinder is being pushed not because of his ability, but because of his skin color and ethnicity; in some ways, when you get right down to it, Jinder Mahal is the first affirmative action WWE Champion. Jinder's not a good wrestler whether it's in the ring, on the mic or as a character; watching him wrestle in matches is often like watching paint dry, his promos are the embodiment of "if you've seen/heard one, you've seen/heard 'em all" and there's just nothing remotely interesting about his character. I've said it lots of times: at the very, very, very most, on his best day, Jinder Mahal is an average professional wrestler with a fantastic physique.
Lesnar's flaws as champion have been the fact that he often doesn't come around and he's no longer the dynamic in-ring performer he was 15 years ago. In 2016, Brock Lesnar earned a reported $12 million in WWE for making what amounted to a handful of TV appearances and wrestling an even smaller handful of matches. However, I don't hold that against Brock because I, just like everyone else on these boards, would most definitely take Vince's money if he was stupid enough to give it to me. Up until the past several months, Brock Lesnar's matches have consisted almost entirely of squash matches that revolve around him delivering a plethora of German suplexes before hitting the F5. Prior to what we've seen from Great Balls of Fire, Brock Lesnar had spent virtually his entire time in WWE, except for a few matches with John Cena & CM Punk, making modern stars look like scrubs whereas the only guys to hold their own with Lesnar in feuds were Attitude Era guys like Triple H, the Undertaker and Goldberg. As a result, Lesnar's matches had become all but unwatchable until WWE took a different approach for his match with Samoa Joe at Great Balls of Fire: they made Joe look like a threat due to making Lesnar look vulnerable by having Joe get the best of him. During the match, and the brawl that happened before the match itself, Joe again looked like a worthy challenger, someone who was on the cusp of beating Lesnar and they kept that going through SummerSlam with his bout against Joe, Roman Reigns & Braun Strowman and for his singles match at No Mercy against Strowman. While I'm still not a fan of Lesnar ultimately not being around as much as other champions, at least his matches have finally become worth watching and actually help elevate the younger talent instead of the company booking them to look like guys who had no business even being in the ring with him. Lesnar still has issues regarding his singles matches, the guy's lazier than hell much of the time, but I'll take improvement where I can get it.
I get that Jinder being WWE Champion is purely business, like it really should be for any main event champion. As I've said in some other threads, just think of all the money that could be generated if only a small fraction of a percent of the population of India signs up for the WWE Network. Let's say that beginning in December, during WWE's tour of India, through WrestleMania that 4 million people from India, on average, subscribe to the network; that's a ton of money and it's possible considering that 4 million is only about...what? a fourth of a single percent of the population? If it happens then, unfortunately, Jinder's status as a main eventer will be secured and we'll have years of mediocrity to look forward to in the main event picture. I get why Vince is pushing him, I understand it, but that doesn't mean I like it because it's my opinion that Jinder isn't a good wrestler at all.