No it's because we've been crap so far and one win against a team that didn't do their homework and you're celebrating like we've won the PL and everything should be forgotten.
We seem to go round in circles with Ole. Good periods or just periods where we scrape wins, followed by bad periods, rinse and repeat. It feels like we've been here 3 times already, including the time we hired him after riding our luck vs PSG. After that we won only 2 games in the PL until the end of the season. Then we had a terrible start the following year and had I think our lowest points total ever in the PL at Christmas. But when the good results come, posters like you want it all to be forgotten.
The problem is good wins at this club are only worth something if they're consistent. We finished in 3rd last season, which is what some people hang their hat on with Ole. But if you look at the bigger picture, only 66 points in a year that the standards were low in the PL. Look back through PL history and 66 point is generally around 6th or 7th, which is where our 66 point in 18/19 got us. So surely you can see why people take these results and good periods with a huge fist full of salt and don't read too much into it.
But in that season he was also saddled with the likes of Pogba, Lingard, Pereira, etc. He's inherited a terrible squad compared to what he played in.
I don't think there's anyone who would disagree he looks second-tier at best regarding tactics. We saw that under a more tactically versed manager (Jose) it could get around 15 more points.
But he does know the mind of a true winner. The mentality of sacrifice.
For me personally it remains an extremely tough decision between those two elements: 1. he's lacking vs other more progressive and/or top-tier managers, so there's a built-in ceiling to his ability vs 2. he knows the mentality of a true winner who sacrifices everything (money, partying, status, personal relationships, petty grudges etc) for the win.
#1 is inherently potentially short term. As long as Dumbwad and Drudge are still here, success under a better tactical manager is potentially limited to however long the manager stays; it's inherently unstable. #2 is an intangible thing that exists only in extremely particular top-tier organizations and it's something that money can't really buy and that, in fact, trying to buy with money actually destroys.
We won't easily find another manager who understands #2. Klopp is probably the only other visible one in top-tier football right now.
(Obviously combining 1 and 2 like Klopp is the ideal.)
Bottom line, IMO we need to see what Ole can do with a squad that doesn't have the likes of Pogba in it. If someone told you that we would have to:
A. wait for three more years but
B. we'd still be kind of moaning that Ole's clearly not up to scruff tactics-wise BUT
C. we'd be truly competitive again with the Bayerns/Reals, and be very clearly enamored with the right personalities at the squad
Would you take it?