Well, you may laugh, you may roll your eyes--you may do both simultaneously. Yes, it's a little cheesy; yes, the acting was not brilliant; yes, some of the gags seemed to repeat themselves. BUT, did I enjoy myself? Absolutely.
The humor mostly relies on a lot of physical comedy (people making blunders and bumping into things...), very little real "wit". I can't say even that the dialogue or the chemistry between the main actors was very good. But if you already know you're a sucker for romantic comedies (particularly heavily humor-laden ones, whether brilliant humor or otherwise), you will probably enjoy yourself. If you're the kind that is only rather surprised when you actually do find a romantic comedy you like, I really don't think you'll be finding it in this one.
No need to repeat the plot; the trailer says it all. And, really, with as simple a plot as it has, the trailer truly does pretty much say it ALL.
In short, it was relaxing and amusing (sometimes not the sort of amusing the director was going for, perhaps), and I enjoyed getting out of the house to go sit and catch a corny smile. Don't go if your demands or expectations are much higher.