The "recommend button" is a really convenient way to tally votes and in the long run, I think it's the best feature for this purpose. With that said, there are a few things we should all be mindful of :
1) Double voting : I'd hate to see someone's vote not get counted because they accidentally double voted, or if they tried to change a vote and unsuccessfully de-clicked the original one. The mods have enough to do already--- would they mind if we "report" the vote, and request that they send an e-mail directly to the user?
2) Thread priority : When people posted their votes, it kept the voting threads active and in the top of the "Last Reply" queue. Because recommending does not change a thread's number of replies, voting threads now seem to get buried and fall into the ether.
3) Sockpuppets : Embedded in a long list of +1s, it's pretty easy for someone to go unnoticed and deliberately troll a vote, or create a fake account in order to add votes to sway it. Voting threads are fun but low-stakes, so I couldn't imagine anyone pathetic enough to do the latter. But trolling does happen.