I can't speak highly enough of Rayman personally. It's just such a joy to play thanks to the perfect controls, amazingly whimsical visuals, the awesome soundtrack and the phenomenal level designs. Loading times are mercifully brief as well and the game has a lot of content.
I'm personally not all that bothered about the omission of multi-player. Rayman Origins isn't Super Mario Bros. Wii. It gets tough. Really, really tough in fact, and it also ramps up the difficulty fairly early on. Played a bunch of it with a gamer buddy who just wasn't all that much into jump and runs, and from world 3 onwards he basically spent most of his time floating in a bubble, waiting for me to come to the rescue. Needless to say he wasn't particularly enjoying the experience all that much.
Rayman, as cheerful as it may look and sound, makes you earn your victories. The game's mentality is decidedly old-school.
So far I have Wipeout 2048, Rayman, Blazblue CS Extend, Motorstorm RC, Escape Plan and Stardust Delta. I'm enjoying them all, but in terms of feature richness and polish, Rayman and Blazblue probably top off the list. A bit unfair really considering neither of the two were traditional Vita launch titles. Both were already amazing on consoles after all.
My feelings about Wipeout are unfortunately a little mixed. On one hand I think it's easily the most stunning looking title on the handheld, and when everything comes together it easily rivals the best Wipeouts on the market. On the other hand I'm super frustrated with the direction the series seems to be heading towards: I hate the combat events. They encourage you to drive as slow as possible in order to not miss any of the weapon pick-ups. Weapon pick-ups which you then unleash upon the opposition in the hope to rake in enough points to pass the event. It's devoid of speed, basically devoid of skill, and depends more on luck than anything else. It's the polar opposite of what Wipeout is all about. This wouldn't be so bad if there weren't just as many combat events as there are racing ones.
I also hate the lack of options. There's no race box anymore, so if you simply want to play an event on a particular track (be it zone, combat or race) at a speed level of your choice, you can't. You can't even do time trials until you've unlocked all the tracks via the campaign. It's either online campaign, offline campaign, or nothing at all.
Online is also quite frustrating due to lack of choices. You are simply dumped into a pre-defined event, and when you complete it you get to vote on whether the next event should be combat or racing. That's all there is to it.
Still, when 2048 is good, it's really good. Track designs are all new, and uniformly outstanding. Handling is fantastic as well, and the audio visual package is an absolute delight. With the prospect of fantastic dlc the game should have a bright future as well. In its current form it probably hasn't even hit its stride yet.