It was interesting to read the reviews of Secret Life and Ghostbusters because they got good reviews, but reading them a lot of the reviews were more along the line of 'it's got flaws but overlook them'. Something a lot of the critics were unable to do with LOT.
I think Alex is going do fine regarding the reception from LOT. He did get some bad reviews, but overall I doubt that it's hurt his career. He did not get Taylor Kitsched, as many people where thinking/hoping.
The domestic box office is better than expected, but the overseas box office is less, I don't think it'll make 400 million, even with Germany and Japan opening next week.
Looking at Box Office Mojo's list of foreign countries they're missing a few that it's been released in, like Sweden, so the actual numbers may be a little higher.
Watching some of the trailers being released at ComicCon I've enjoyed some of them very much. But the King Arthur trailer is ... not good. Though someone at Box Office Theory suggested that WB market it like they did LOT, just focus on Hunnam's abs.
I don't know about 'Secret Life' but Ghostbusters has got some bad and controversial reviews as well but unlike in the Alex following, fans and followers didn't help media to spread bad buzz and negativity

I admit I wasn't too excited when I heard Alex is going to be a new Tarzan but the film wasn't anywhere near that bad I thought it will be, especially after reading all the negative press and bad reviews here. It was very enjoyable althought there could have been more Tarzan and Jane sexy time

Also it's good to hear that Tarzan is doing quite well moneywise, despite all the "fan support", bad press and negative reviews
