I'm happy with the acquisition of Daniels, but I'd probably be a little happier with the acquisition of Hill. Personally, I don't think the age thing matters all that much. Hill is older and has an history of injuries, but it's not like Daniels is the Cal Ripken of basketball either. And I don't put much stock in the argument that Daniels will still be around in 3-4 years and Hill won't. Yeah, that's true, but if Marquis Daniels is ever starting on this team it means one of two things: 1) we're mediocre and aren't going to win a title anyway, or 2) we've signed Lebron. And in the latter case it just won't matter who we have at the 2/3 next to him anyway.
Overall though, I'm not complaining. We have someone who defenders have to worry about, capable of playing enough minutes to back up Pierce and Allen, who has some playoff experience (from his days in Dallas). I'm happy enough. Even without the signing of Wallace, the signing of Daniels would be an upgrade over everything we did last offseason combined.