I've had a couple of bolt actions that were DOGS, so of course the Marlin's I've had (and others I've shot) out shot them. I'd have to call it about even, really. I've had many more bolt actions than lever guns, and they've all been decent shooters or better. I'm not a long range hunter, honestly, so if I'm getting 2" groups, that's enough for my needs.
My four most accurate guns I've had:
CZ527 Carbine in 7.62x39 with 122gr Wolf (Crazy yes, but it was under MOA all day long, hot or cold)
H&R Ultra 25-06 (1/2"-5/8" consistently with 120 gr Remington, untuned out of the box)
Ruger 1A in 7x57 (MOA or better with 140 gr Remington, out of the box)
Winchester Model 70 Ranger 30-06 (3/8" 5 shot groups with 180gr Failsafes)
I've never shot a Marlin in any caliber or model that grouped more than 2" at 100 yds, scoped, with loads it liked. Most were consistently less than that. For shots under 200yds, I'd take a Marlin lever gun over a bolt action any time. Love they way they handle.