So the Founder's Pack ($40) is now available for Heroes of the Storm. It gives you instant access to the game including 3 heroes and a few other cosmetic things. I'm considering buying it, though I'm not sure it would be worth it.
I'd say if you really want into the beta and $40 is something you'd be willing to spend for that, sure, and the heroes and skins they give you are icing. But unfortunately the heroes they offer are all on the lame side. Raynor is an average hero, but he's dirt cheap in terms of in game gold to buy anyway. I got him as part of the $5 "starter" bundle you can get in game which I think is WAAAAY better in terms of value (it gives three solid, but cheap, heroes).
The $40 bundle has been in the game for a while and is almost the joke bundle in terms of value. Raynor is cheap anyways, and if you own him from the starter bundle, you get nothing back for already owning him if buying this bundle. Tyrande right now is considered on the 'meh' side, but a really skilled player can make some use out of her. Diablo is considered a strong candidate by most players to be the WORST of the heroes (although to be fair, he's shortly due for a reworking, so we'll see how he ends up).
So you're not getting great value in terms of owned heroes, the free rotation is going to offer you more interesting choices every week anyway, although I do think Raynor is a solid hero for a new player who wants a lot of consistency (but then I'd say get the starting bundle, which unfortunately does not provide beta access... so meh).
The $ in the $40 is really going toward the skins. I have no issue spending money on skins that I like, but the ones given in this bundle are not particularly interesting (Raynor probably the best of the three). If you don't give a crap about skins, you're not getting anything here.
The gold cyber wolf mount is exclusive to the bundle, so there's that. I like wolves, but I spend $ on the actual wolf mount, which I think looks a lot more bad ass.
Is instant beta access alone worth $40 to you? Buy it then. Otherwise, I advise against using the contents of the bundle to sway your estimate of its value, unless you really really like the skins and mount.
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As far as talent gating. I'm on the side of indifference as far as that goes. On some heroes it's more obnoxious than others simply because of the order they ungate their particular talents, but it really only affects it for a couple games and it's not like you're going to be a rock star with a hero the first time you play it anyway. I do believe it encourages players to look more at each talent instead of just picking a cookie-cutter build from day one and not even considering the other options. The latest patch changed the ordering the level 20 talents unlock to make a lot more sense, so that's a plus.
Overall though, I think it's something players make WAY more of a big deal out of than it is justified, and if it's their biggest complaint with the game, that kinda speaks toward how awesome the game is in general.